diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-1.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-1.json
index a75da1a931494179aab49fcf2794d67af375716f..dbf6aa67c08c859067e568d46b74016f2aac0c9b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-1.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-1.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.1",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:A4",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-10.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-10.json
index f0aff7c5af13352c123ade7a42b4b6b4935a0dff..5c269006d6c36f5c4378d35d64e921f34840817f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-10.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-10.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.10",
-      "mac": null,
+      "mac": "00:60:DD:47:59:65",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-100.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-100.json
index 64f369f4787f676f91c4ee502b45d7b49773a4d1..2f115818f1d4bd3f81bde2cebe5447a83d27121c 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-100.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-100.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.28",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:8B",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-101.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-101.json
index ec36795093c731eae393888d9c87c10c120d35e2..9f3b0e342c3e11a274e5243c69de5c5d3fddadd6 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-101.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-101.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.29",
-      "mac": null,
+      "mac": "00:60:DD:47:67:8C",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-102.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-102.json
index 79af57e862d76bf4a005ec58feb96046035e93dc..c51df25b37e340908e8454f29b4ee4c45ecb5486 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-102.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-102.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.30",
-      "mac": null,
+      "mac": "00:60:DD:47:68:44",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-103.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-103.json
index de3a37a4ef871bb50893d0e680669c528c58a3ed..10f524f9618d42eca3ea1fc3739820cb1b867a4b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-103.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-103.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.31",
-      "mac": null,
+      "mac": "00:60:DD:47:67:8B",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-104.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-104.json
index 33208ad1e453eb503212cbd2fbf6cb6acc40dda8..5df685854f9282adf278ce356c93ffb2af08dbde 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-104.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-104.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.32",
-      "mac": null,
+      "mac": "00:60:DD:47:67:8E",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-105.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-105.json
index c949be3c2c3031a57d095da01b205e192d08690b..e39863dc4b9e4e561becf2fc2d3817eb81d9900d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-105.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-105.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.33",
-      "mac": null,
+      "mac": "00:60:DD:47:68:4A",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-106.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-106.json
index 3d94160031bf47fdada9f6fb14994dcc0ffe1b5d..429a034703327df24f2fa484024224b246f3d900 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-106.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-106.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.34",
-      "mac": null,
+      "mac": "00:60:DD:47:67:88",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-107.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-107.json
index d2af3d7c4216b321810a2f5b8135cb2e7356d682..4746500eca0481b41c950f0140eda14dcb15b88c 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-107.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-107.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.35",
-      "mac": null,
+      "mac": "00:60:DD:47:68:19",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-108.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-108.json
index 412a996ff580d9e7ae4e95b2f8f2dea6b11eea31..07a2c0014201e10980f2f7c6aa5b8cf259d69f71 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-108.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-108.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.36",
-      "mac": null,
+      "mac": "00:60:DD:47:68:12",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-109.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-109.json
index 5a91a1aa875bc8d039dfbbb568bc46073b8bda42..1099580c212ffbd382937a0b7253dba4b4a073ba 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-109.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-109.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.1",
-      "mac": null,
+      "mac": "00:60:DD:47:59:7E",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-11.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-11.json
index 254783612128151f55dbd109262d58d2a7e68552..06308541fd1fa4294ca0614d0d4e6fd654188332 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-11.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-11.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.11",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:53",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-110.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-110.json
index 75901726d16ece69dd3b1cb8e5e8267194438e4d..4800e2a993d703806f3bfa3d17ebc1f427c77ab0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-110.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-110.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.2",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:A7",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-111.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-111.json
index 4313f8a9dd5ad47c2a5c0c8a657395f2aa5b9bff..8c35faba69eade6daa0ddc444de89d44b61769c5 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-111.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-111.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.3",
-      "mac": null,
+      "mac": "00:60:DD:47:65:C2",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-112.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-112.json
index 0c8d30507261b90a14082b7505012ba5bc43c912..a730d10b068b41442c560a8df8c3276303789cc2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-112.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-112.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.4",
-      "mac": null,
+      "mac": "00:60:DD:47:65:4F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-113.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-113.json
index 40223466f8f31f31d5a13f594dbebe1d755c202b..429b79be99698eaf42e822e38158fe183bb686a7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-113.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-113.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.5",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:56",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-114.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-114.json
index 89d9f2c7ca34be4abcaedb3f15f4cc00241f68a4..0f566bfd2df82d03397af758646fc1eb6e0f1bf0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-114.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-114.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.6",
-      "mac": null,
+      "mac": "00:60:DD:47:66:01",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-115.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-115.json
index bca40f7e8d9a6f1515e49887be51d20908c8fa86..f1efc13f7233c01a637c2fd9de22068c4d1013ad 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-115.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-115.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.7",
-      "mac": null,
+      "mac": "00:60:DD:47:65:B9",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-116.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-116.json
index a20c09b601c5612ddf0702f7d4d1ccdd446872e8..ca39b1574ae2ea195c5866496f300be0af347b44 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-116.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-116.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.8",
-      "mac": null,
+      "mac": "00:60:DD:47:59:39",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-117.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-117.json
index ebec6b899c384b2db856d93c6153811b83bf23f7..c0ac350d10a2d1fd906eba2e4b7d7c2c95d030af 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-117.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-117.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.9",
-      "mac": null,
+      "mac": "00:60:DD:47:65:BC",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-118.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-118.json
index c40d56c71ef31fbe485cc9becb18daeae554bfb7..6c857b4baf9d6a082501df7cc823803b9f8d7475 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-118.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-118.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.10",
-      "mac": null,
+      "mac": "00:60:DD:47:66:1B",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-119.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-119.json
index aa2a267ec42560d536911012dd869597bc01b197..5685110da7202d846d00d38b3d33dfbee23bdfcc 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-119.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-119.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.11",
-      "mac": null,
+      "mac": "00:60:DD:47:65:C1",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-12.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-12.json
index ff63ebe41be53caac605a3703fe98d27a6690f22..eb5cfa5ce1512ff5cf7941ea10a2618d44288138 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-12.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-12.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.12",
-      "mac": null,
+      "mac": "00:60:DD:47:59:64",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-120.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-120.json
index 880ced199b5451ccaa44f53e660b1e4d92ecc20d..b25e3e2701bbfb8f5d7f510c7c335c9aabfc9d54 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-120.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-120.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.77.12",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:94",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-121.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-121.json
index 339656a3a8b0dc9f695298307369916d122ebc69..072ec7bb8b2142b9d478f0999186515d7b0ac654 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-121.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-121.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.13",
-      "mac": null,
+      "mac": "00:60:DD:47:59:7D",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-122.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-122.json
index 9e988ba1eca14948d98ea402addf6a08dec8eb82..8ccd13382ac9b5006bf99631d76ce453f1a0a162 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-122.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-122.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.14",
-      "mac": null,
+      "mac": "00:60:DD:47:59:3F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-123.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-123.json
index a124fee9f5e502b62fac8c62dd106bc873541faa..f27294604ab26c4d2e01b4f0f68405055ad7657e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-123.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-123.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.15",
-      "mac": null,
+      "mac": "00:60:DD:47:59:7A",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-124.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-124.json
index 4b18902833e1d6c692ca252824c9c0fdd81ea733..18904248fa872bcb96e3ecd3c365e505405cda23 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-124.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-124.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.16",
-      "mac": null,
+      "mac": "00:60:DD:47:66:00",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-125.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-125.json
index d7e961dee5ab9d8d4537ef7c76721765234b3b0e..994d599360fc187d8a2b49e305e28465468ec582 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-125.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-125.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.17",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:55",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-126.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-126.json
index 05727354b46e3f3109fd7c7ddb8d0c4d54132261..6284241b9ebd88346b5f302e7807c86f34102e61 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-126.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-126.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.18",
-      "mac": null,
+      "mac": "00:60:DD:47:88:FD",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-127.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-127.json
index 424b62fdbe5b69d24c812d9a65fd04813371def5..81b6f4f9387a3e00d0efe79ea408171608fc5d8b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-127.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-127.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.19",
-      "mac": null,
+      "mac": "00:60:DD:47:65:D9",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-128.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-128.json
index 9fc54dd4f23d1bc49da918753c166e6db72b272f..f714500f4a7aff08d3c491278e78bba8d9201491 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-128.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-128.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.20",
-      "mac": null,
+      "mac": "00:60:DD:47:67:FC",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-129.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-129.json
index c22114800bc11f4db3947a616f8d2f16db398a09..0687bb32fbf809e96cbdcea3fb7185ffa172e2ac 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-129.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-129.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.21",
-      "mac": null,
+      "mac": "00:60:DD:47:59:32",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-13.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-13.json
index 6d6606a77bc1cae9ebc400c1eef5d1f9802ae034..dde83e1723231231072cac79038edb4004731088 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-13.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-13.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.13",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:99",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-130.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-130.json
index e410a3f941d0c30e19ba6c5771a211162f35e3ee..f26acc12ebcd816759b93093597da09f3f19aa7e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-130.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-130.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.22",
-      "mac": null,
+      "mac": "00:60:DD:47:59:FD",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-131.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-131.json
index a73d1a371d5e130d8a138d5c4843189c4d2d9ec5..417f5eaab0268516defe7867ca142f78358d3725 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-131.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-131.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.23",
-      "mac": null,
+      "mac": "00:60:DD:47:59:6B",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-132.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-132.json
index 37a9edf97e554826afde279109d754e98e5272d2..a6c9edb7cca68aac2d21001212c7e060d7ef68bd 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-132.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-132.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.78.24",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:BF",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-133.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-133.json
index 7c6460aca8990e7e984b13be31cffabd91541fae..58b04daf0e574db25ba4bdce583a88c3111f907d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-133.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-133.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.25",
-      "mac": null,
+      "mac": "00:60:DD:47:59:B7",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-134.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-134.json
index 709da780bb0d126c5516773cd1e9a21f25492849..8077e13553bb008a77d3f6cc6e32eacb162f287d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-134.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-134.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.26",
-      "mac": null,
+      "mac": "00:60:DD:47:65:BE",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-135.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-135.json
index 1d5f652c7f5906e7f5f56e2439f06f27a147540f..b6e1ba42d0b7ade2137c575aa37f54fec5cba7b1 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-135.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-135.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.27",
-      "mac": null,
+      "mac": "00:60:DD:47:59:70",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-136.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-136.json
index ba80fd18c7bc0e0afb0a1a0c3b5dbfe6d2273122..3a5444e6b31abc164ac34bfb99ae79e7a9b61b39 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-136.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-136.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.28",
-      "mac": null,
+      "mac": "00:60:DD:47:65:BD",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-137.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-137.json
index 63523766aec31d289e90ce6a9e103558955e8879..710761941624867a2245f14486cc606d85038031 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-137.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-137.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.29",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:A5",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-138.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-138.json
index b2bf9c1dd1c1b076e4c90a61d34e92e0ebaab1d6..9762069724585799a159c4f237affe2eb8ae910b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-138.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-138.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.30",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:76",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-139.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-139.json
index 3c1cdd831e13c5378e94d3ee952fb4d55849789a..d2da700c86c0f5dbcb841f924b2f6d7b29555093 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-139.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-139.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.31",
-      "mac": null,
+      "mac": "00:60:DD:47:65:AA",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-14.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-14.json
index 0ccc04a954c59d7101e62703997453e56aa33215..a0b11aaf91df54fb27f8aefdfbcd031bcf2eab36 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-14.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-14.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.14",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:5A",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-140.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-140.json
index 787f556130ffbf4fd491c25d6f4b4a0799852ff4..95975824715f5bed19c84cc512222b4b76ce98a8 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-140.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-140.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.32",
-      "mac": null,
+      "mac": "00:60:DD:47:59:62",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-141.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-141.json
index 3870b9beb3342e6ee618ae30924180f50929ac84..145ec33bec72d767b1842a366d0995ff7ff8a4bf 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-141.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-141.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.33",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:B7",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-142.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-142.json
index 46a63562b77ce28dc3cee027434433175a3761da..205c60ebefbebc2a81fbe77e61fd4a0af7fb3c15 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-142.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-142.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.34",
-      "mac": null,
+      "mac": "00:60:DD:47:59:B6",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-143.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-143.json
index bbb3122cff130e36c06f4d1d682cbdf8f50f4dde..62188b6ddaf66773f1700de115269ec911583c37 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-143.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-143.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.35",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:B9",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-144.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-144.json
index 87f2fc3a5a30c22ce5bbce0ac26a399cd9018801..ed39aaa2f476db01ad427acc72b1124dc887c8ab 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-144.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-144.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.79.36",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:92",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-145.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-145.json
index 30501abda076ad8ff58c8e3d3eafd272894c5489..342ad61af8f59561017e314e0303289815af3d6e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-145.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-145.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.1",
-      "mac": null,
+      "mac": "00:60:DD:47:68:7B",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-146.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-146.json
index 89db8252a7f9bb7ae599a9abec36b44d7307258f..1abbd1920d58319e7cb9284257fc69794190f866 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-146.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-146.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.2",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:73",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-147.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-147.json
index a440d06523536b68647dafdca76ed9bac5ec2eed..b02dfd639c6ce00388012feb2982daafe9382e76 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-147.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-147.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.3",
-      "mac": null,
+      "mac": "00:60:DD:47:59:79",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-148.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-148.json
index 9f4575dcb1f5c0eee6b3ed585321384addec58d5..c4117adf922f9a7f52951f300f0fe23bfddffb57 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-148.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-148.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.4",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:79",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-149.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-149.json
index 99262c34557ecce3f4d3a33b2b93830e58557934..d21f037f4125d5200b1d06f4b41b3dffec7395c7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-149.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-149.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.5",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:C1",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-15.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-15.json
index 4830bc6e0a2297f1cf9e4f1703f115088181884d..42a56e870867a58b7ca50fd2edc7e93d5c6139a2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-15.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-15.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.15",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:58",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-150.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-150.json
index b7bed9f9b685e0f95e9f2f037f67fc2fa9564ced..b917356d2d711b40bc7e6489e671ec3c18934ba7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-150.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-150.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.6",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:C3",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-151.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-151.json
index 5fd397eb2f22e4b77e1984f959346665dc5f67b0..e96c9bf8dcd59e28cde96a15480015e9320f463b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-151.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-151.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.7",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:BD",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-152.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-152.json
index 5068874175aba1984ce7d82c942ed12ea99c953c..8ce201680d85ab33456ef610a7c33e3f90dbebe6 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-152.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-152.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.8",
-      "mac": null,
+      "mac": "00:60:DD:47:65:B3",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-153.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-153.json
index 84123d998264234c4edf082eaea655c74780f99c..acfa8d9c69ab93cb182ccb74a1a3c655e8e27503 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-153.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-153.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.9",
-      "mac": null,
+      "mac": "00:60:DD:47:65:DA",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-154.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-154.json
index ea2efea3ff688b0b789746159436f6e364751e0e..6314dbce10bfb4a3c9019fe1e525786d2cf1ac66 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-154.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-154.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.10",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:B5",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-155.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-155.json
index abf277473b32470f3f22db2757c113ab5edfa801..c8fe4ef7dc758dc0be1388b7afbc6a564dfb5ad9 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-155.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-155.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.11",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:8E",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-156.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-156.json
index ae23aa4446d8be36fa622aca204729e92e4af32f..b3ef18d795e65dfc53ddc2f7e74e67b4f74cba6d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-156.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-156.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.80.12",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:BC",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-157.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-157.json
index 3582ea2fd1e3bba8bcba6f158f11a327905ee21c..2407560fa88a4ebdbbc95bc0bb2e1fcb3c9d139f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-157.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-157.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.13",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:B8",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-158.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-158.json
index 48ae25b9c0ea093d819d05131f80d67aa49a3a92..6f8cca54c924d79d10d364f7a214863385c45024 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-158.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-158.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.14",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:C2",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-159.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-159.json
index 3dab1d6f1e3a630d9f473a60b4120ed58e51af3f..a6980a8cf7589c5b1ce53b6b73ef0d420e91435a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-159.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-159.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.15",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:77",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-16.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-16.json
index c28700534848628e6dfcee26c3143c6a192eb4f7..d23a725ae70a02ab8b04c4e0d7f5f16a790d6392 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-16.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-16.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.16",
-      "mac": null,
+      "mac": "00:60:DD:47:68:85",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-160.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-160.json
index ac0152eb6290b153394cae98707ca56ce8dbe612..d87165c75b6cd9c1965c4bfcc875c101ee618828 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-160.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-160.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.16",
-      "mac": null,
+      "mac": "00:60:DD:47:59:03",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-161.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-161.json
index 2aa5a531cab6534d2ecd9e1c254ca3dc2eef6465..f7cbbfc7a14d745387a7e9fd33e6258d31a221f5 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-161.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-161.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.17",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:72",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-162.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-162.json
index 621dbff37665ddf47c5a4835e40df04d9f81590a..1aab505b7629194db7a5d6964fac60de87d46fad 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-162.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-162.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.18",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:BA",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-163.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-163.json
index 7f3c2efec7b15195035ffbf8b28b98737ecfae9d..7b0cb8030c068fbca8692964e2dfe9f89afd61ba 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-163.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-163.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.19",
-      "mac": null,
+      "mac": "00:60:DD:47:65:A7",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-164.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-164.json
index 7f6e98edd2bda8a6d64bf6e19aebb5d9cb82a0b5..35c82354ed301c70eef77135cab1ce5cefe72358 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-164.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-164.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.20",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:C6",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-165.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-165.json
index c36c1daa76aaa84e1b28d215e0fcc455a9a1a11f..d2a5bc50808f45139dcdd50213f9fc63f4864040 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-165.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-165.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.21",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:C7",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-166.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-166.json
index 98e29146199da62221a50c1f801a556fa94cefeb..e0f7046d107628c4244d7e6d07e855b7109dfea9 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-166.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-166.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.22",
-      "mac": null,
+      "mac": "00:60:DD:47:59:FE",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-167.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-167.json
index 06963d53aa23993af77664de9795e04300919146..b650c47bc3b66e3ee12909c0be72c775ccd8cf5e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-167.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-167.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.23",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:BB",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-168.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-168.json
index e103404536a36d53fde94296d9817ad4bee74168..0a8d0b7c9b5845d050b85a65b494b47755e18e59 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-168.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-168.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.81.24",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:B2",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-169.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-169.json
index 2361b0b3d8eb6344d375169632b6cf0c6b3431d3..cbbe870e069cdf152c69658f1f44578649c60136 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-169.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-169.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.25",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:B3",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-17.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-17.json
index c0a21b9eea0e9c983d0409a4d823ad87ee2a8bad..a12150db9d15e3dee6119eddcf27e466a27c7419 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-17.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-17.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.17",
-      "mac": null,
+      "mac": "00:60:DD:47:63:85",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-170.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-170.json
index 21808c0ab2513e137a562ac57690d3aab1ef05ce..fd0a2b6d50b407e8035fde6a6471d21bc0236ecc 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-170.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-170.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.26",
-      "mac": null,
+      "mac": "00:60:DD:47:59:66",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-171.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-171.json
index 77a72f9c57c4c8fccad50fdb34eacdbc93f14d05..0e70328cb736cd5d49ef59e06d492f861ef92435 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-171.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-171.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.27",
-      "mac": null,
+      "mac": "00:60:DD:47:65:A9",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-172.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-172.json
index 5869cb8d33531bd041898c667535efa9f873c311..f902ee4aa7cb0d0198a598d5fca3ce2708b43f57 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-172.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-172.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.28",
-      "mac": null,
+      "mac": "00:60:DD:47:65:BF",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-173.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-173.json
index 1e0a940c2011e1c1da09db2c2d4681eef8831de6..27f9cf7884efc8c64b804f23940beae2e65d1b15 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-173.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-173.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.29",
-      "mac": null,
+      "mac": "00:60:DD:47:65:C3",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-174.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-174.json
index 402c0afe99196858905766668d6c4be12d40b2b9..f97b63274dd29f70d70ef726d5c01051cba9ab56 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-174.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-174.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.30",
-      "mac": null,
+      "mac": "00:60:DD:47:65:A8",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-175.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-175.json
index e6f64401d6b7da104157bfb62af1cd3f3ad507f6..0ea6c2db3e6e9bcf2fa28ae933c9a01d6629c78a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-175.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-175.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.31",
-      "mac": null,
+      "mac": "00:60:DD:47:65:BA",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-176.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-176.json
index 09fba8b6231ad75e3b14458c421ca28739554b74..6636ca7b2d0e7f86fc9c7cb008660ba2b07ba595 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-176.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-176.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.32",
-      "mac": null,
+      "mac": "00:60:DD:47:66:03",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-177.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-177.json
index 60b2759997584c0a2ce735553be46ab99920692f..cac4e11bbca8c1a208a99d43e19d3b76f3d2561a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-177.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-177.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.33",
-      "mac": null,
+      "mac": "00:60:DD:47:66:04",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-178.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-178.json
index 3da19df3cf1168f11dad9eb9e4d461bc095d0ddd..c0ce9deb23f0f81278b16742df9bf5857b7fbf3d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-178.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-178.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.34",
-      "mac": null,
+      "mac": "00:60:DD:47:65:D8",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-179.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-179.json
index 50e6c0076706c211ba11bf0763ce19e3dfd8e313..4bbd58dc9fe4d5e634b676126130c2e76f31ecaf 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-179.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-179.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.35",
-      "mac": null,
+      "mac": "00:60:DD:47:65:B4",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-18.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-18.json
index 738ba4343458b2d16741bcd5257eb87b33068e37..3c6da99ca2906290e0c30d70421991661c5671c4 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-18.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-18.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.18",
-      "mac": null,
+      "mac": "00:60:DD:47:59:6A",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-180.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-180.json
index e3a7d9d1358fedfdfb2126ca0fe277e15bac6b06..5effb87745ec4b59835184f8da2cf0381da155cb 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-180.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-180.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.82.36",
-      "mac": null,
+      "mac": "00:60:DD:47:59:31",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-181.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-181.json
index 0a2426bc2df45de1c8939f33be677f572d24c357..dbdf1a0bf07214f881ea35e6a4f3a11cb9fbedc3 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-181.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-181.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.1",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-182.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-182.json
index 3c18a455b87ec5d89e7808eaf424e4bcd42dd5c5..32f882bfa799d54300d0e7146578a315707763fd 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-182.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-182.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.2",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-183.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-183.json
index ad81554e0896964fc64a7ad7856b85e088bf6a71..8131922043dd6652a5aeb8b414d516bd9c70c6d8 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-183.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-183.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.3",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-184.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-184.json
index 7a5bc968775e121d77b43e26c0f1abaf811cdb89..d2ac0eaf65de1321adb7f64abcede86c5d638646 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-184.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-184.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.4",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-185.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-185.json
index 1ef5fea6586260d9cffb78356bdcc0a78e3c1cca..e12fcf1041e930b9bba711c8b33654e6a07c4261 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-185.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-185.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.5",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-186.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-186.json
index 19338dbab422ce8f557b1ddf97b0b2128a7655e3..f2131bec4e3b45e1e6183ad7fe34144b92ce9061 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-186.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-186.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.6",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-187.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-187.json
index 7233ffa211ab03c084da3012e0740a925d9d9251..d9995033531952bf26f35f7a6330587a7977d58e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-187.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-187.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.7",
-      "mac": null,
+      "mac": "00:60:DD:47:86:54",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-188.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-188.json
index 99613636f3d315950d75f1fc87819d693ed05036..a74d8581b06447507e5c7a6504f6ce78958d727d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-188.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-188.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.8",
-      "mac": null,
+      "mac": "00:60:DD:47:7C:63",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-189.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-189.json
index d1097f3bd1f9157334cc7f15dfcee8aa9bcb71ff..3e974e36c71ea41bd0884a08230ccb423ded2888 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-189.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-189.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.9",
-      "mac": null,
+      "mac": "00:60:DD:47:86:57",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-19.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-19.json
index 2038b49bf2d40db581c265e2693f06a457609684..734314868caf6ac8230820efd2d115dfecc01898 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-19.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-19.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.19",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:54",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-190.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-190.json
index 68b2006c97076044a293d6f7452f353892d77f5a..07eeabde45b54a99ba66da1bdac48493970b3f23 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-190.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-190.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.10",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-191.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-191.json
index 6c59da3f8670c2b57cbcd1daa9d521e4e912b4d3..0cde976bc786d791ef9dd54bd9b5ec20ee77d1cb 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-191.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-191.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.11",
-      "mac": null,
+      "mac": "00:60:DD:47:86:53",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-192.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-192.json
index d4dfe09296ce1390a11ccef395f01c5db59cb038..e380c6a264ef60b643cee2bb367f74bf067a34a9 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-192.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-192.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.83.12",
-      "mac": null,
+      "mac": "00:60:DD:47:86:45",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-193.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-193.json
index 7da58773cfd1bcf0603a5b7810ee885025b4ff3c..f85ced54d39ecb64382459defc96b571ed8191ef 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-193.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-193.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.13",
-      "mac": null,
+      "mac": "00:60:DD:47:86:62",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-194.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-194.json
index c542cd363d4cf7fba06fa65328772978f7251aff..50f63e3176315240c9f12e8d020daeccfe94b727 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-194.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-194.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.14",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-195.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-195.json
index fb90a2b20e3eee6e0e7a40a418070284915a6cb6..f15a0513fae3a28b22df783450fae7d2b5164571 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-195.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-195.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.15",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:A3",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-196.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-196.json
index f616f3704219c1844ddb28d7ac9ff4f1e29c4d1d..f377b4a43a0fbc75fee2b7713c39d422bb85b82b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-196.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-196.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.16",
-      "mac": null,
+      "mac": "00:60:DD:47:7C:0F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-197.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-197.json
index 0ceb00b1718e23688d0c113cb1a8985fb0a5c5cc..f1c6e961be0714b6d16a6c98987d3308b936ad2a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-197.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-197.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.17",
-      "mac": null,
+      "mac": "00:60:DD:47:86:52",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-198.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-198.json
index 4dcd0c0f59c29f74256812d33e5d7e13c667470f..7bcfd1298482806ae6f6e0405499ea2746ca1f48 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-198.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-198.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.18",
-      "mac": null,
+      "mac": "00:60:DD:47:89:0B",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-199.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-199.json
index ed8acfd52e6037167111a604738387667270b425..6c356b937cbd508f209a48cbc2b9716620ed884c 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-199.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-199.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.19",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-2.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-2.json
index 0101c216e8d6052f84d8db1b3e33b6a5e8117f65..a92b9942338457eae6aac826c5fe4cea71f083e2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-2.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-2.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.2",
-      "mac": null,
+      "mac": "00:60:DD:47:59:75",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-20.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-20.json
index fbd765e022ffe9d1eac97deda0c52f536a75d6b4..76a0184c7322e631bbeebd007746a5bca3f80e13 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-20.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-20.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.20",
-      "mac": null,
+      "mac": "00:60:DD:47:88:F7",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-200.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-200.json
index 9efd52d8beee624608ee1229bb9559a46515411c..79fe8ec7ec645d08ea04cfc5dca495fcc630b5b0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-200.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-200.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.20",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-201.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-201.json
index 11ba05345fa2a7f372f98781404ff7011b852289..4cff4ef7e30595aef72be226899267466e4f0299 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-201.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-201.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.21",
-      "mac": null,
+      "mac": "00:60:DD:47:86:51",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-202.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-202.json
index 23e6f0e55474fd522066dc1b4f27e4ecca6f9f53..ffa05896174fecb64d481c348a1d6adf422e3aeb 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-202.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-202.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.22",
-      "mac": null,
+      "mac": "00:60:DD:47:86:49",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-203.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-203.json
index 0d3bb93d407551b4784d1f3c47917b01f6cb56fb..bf57afbc3a28851c0fd8e0d13ab45f3ac2aa2d77 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-203.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-203.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.23",
-      "mac": null,
+      "mac": "00:60:DD:47:86:48",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-204.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-204.json
index 43b295b1ab7a6032cc9147fb2008973eb4f7e729..9864c2fbd856c414212e540000a75dd397dd873e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-204.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-204.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.84.24",
-      "mac": null,
+      "mac": "00:60:DD:47:86:46",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-205.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-205.json
index 31e08a4a26329a91413e0f6e106373d3eaa6571d..39f4f4449757ca48ef0223b432ecbd236aaeb2cc 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-205.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-205.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.25",
-      "mac": null,
+      "mac": "00:60:DD:47:C4:3F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-206.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-206.json
index 71d16629e619b7e0d4f521cccbc961308fcf91ba..ddac4c0aa7c677308a85170cdf402410ca57e4e2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-206.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-206.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.26",
-      "mac": null,
+      "mac": "00:60:DD:47:86:5E",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-207.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-207.json
index 71c0aa0937b194c81c9f1c31b9153402c0f3cfe3..6056e6e815c58afb8d62b44c7d27083840b11022 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-207.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-207.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.27",
-      "mac": null,
+      "mac": "00:60:DD:47:86:59",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-208.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-208.json
index a56fcd2ebdb432b9b810a9c892b17bb8475aff76..5190f7320c7287d34f137af29eb44c3c3f9c0880 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-208.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-208.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.28",
-      "mac": null,
+      "mac": "00:60:DD:47:86:5A",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-209.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-209.json
index 5d8179a58fd97ccb22eb10f28a0a77b63c3f3fa4..347aaa625637088c6c8c8f33ba7daaf914149b5a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-209.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-209.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.29",
-      "mac": null,
+      "mac": "00:60:DD:47:89:84",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-21.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-21.json
index 8e93de34cab807737b8f4bfbb86237ff532e9161..0c26569d10477004ae528e67fc73f96f3309fdab 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-21.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-21.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.21",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-210.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-210.json
index 62aa586bd4872a14c040a5eb0dd44102fe86534a..a155db8062a859610745e3c645df435d2060f87a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-210.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-210.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.30",
-      "mac": null,
+      "mac": "00:60:DD:47:89:D0",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-211.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-211.json
index dddca8cf8512ae5ba6b796027c9cbba97758d566..44042b4e0b8a55dc8ca56583f25edac4655e2287 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-211.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-211.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.31",
-      "mac": null,
+      "mac": "00:60:DD:47:86:5C",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-212.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-212.json
index 768870502d1544a5ea8c543c82803dd42dfb1950..cc46e785c591a8d12bfbe78062c277a6023319bb 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-212.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-212.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.32",
-      "mac": null,
+      "mac": "00:60:DD:47:B5:EF",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-213.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-213.json
index 790cb9b09bc509b0809ece4dda815495c1a7ce1f..009df52fbc9cf91bd2a2693cc662ad411c3bb87c 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-213.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-213.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.33",
-      "mac": null,
+      "mac": "00:60:DD:47:86:5D",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-214.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-214.json
index 9ac46fd78b0987df2689fa0c12dbb753e19bc3ad..cb50408cfec20f8fb61ff2f4935d55e4c2c38c48 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-214.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-214.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.34",
-      "mac": null,
+      "mac": "00:60:DD:47:B4:C4",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-215.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-215.json
index 201a356a5290cfb752e83f2a4aad42884411841c..ad1f9eabedf6af833b6a261875e0dd8b0229b74f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-215.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-215.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.35",
-      "mac": null,
+      "mac": "00:60:DD:47:89:EC",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-216.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-216.json
index 0e0dee6419e04bfecb4313c69aeb2b55415af556..5acf6caf7be2ce8cab809a9f6cd37dd25e7bd79d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-216.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-216.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.85.36",
-      "mac": null,
+      "mac": "00:60:DD:47:89:76",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-217.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-217.json
index 5ac848ad970cbc62e391bb1a9e2ebeeaa72cf8d3..475cd114302dff1437a56c6d1d105fe7075ea0c4 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-217.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-217.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.1",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-218.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-218.json
index 6f7ead333a362d9898c4e8ba529c18b88d316f4c..eafce3e593b5caf1620f661e1f097af86729e065 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-218.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-218.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.2",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-219.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-219.json
index bce3425b3705b43d2cdc88415d42be119e025384..844001ed3fed77609c087bcf4128b7cf6a27e53f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-219.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-219.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.3",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-22.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-22.json
index 2993be5a996fe13cf429720a60923b9c28af1894..d0d8a26e137a3874b558896467e85dfd270a8704 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-22.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-22.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.22",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:A2",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-220.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-220.json
index b1c334547f7902e6496439b00e984861e102a635..3cd3bc42bbfae4bcaef5e07006e65f0d27d81838 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-220.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-220.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.4",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-221.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-221.json
index b8759a34d7cab4c3b882531596d5c25e97e17037..432405dd7358db2752464c7866d9253cb40dd9b0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-221.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-221.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.5",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-222.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-222.json
index c878a3f8b8ae48e51dd5faaeed2f1672ed03fa00..79f175e1901fc794e7cc00569ad60932ec6ed19e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-222.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-222.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.6",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-223.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-223.json
index 4077cad36fd10d9e9e6f75a8878bdd0d4fb3ab67..5b72726a75d885924ef96dd7d13ed6a6ad6cb8d6 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-223.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-223.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.7",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-224.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-224.json
index 528b8091f3f0305b515b8c1d7c5b1a780f32adc0..c997952688c50b91d213621e1ccf779d61f5edcf 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-224.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-224.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.8",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-225.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-225.json
index 44acb80a134a24e6746b3327bde1c0f50dcca543..58910883681e706ef93f7e956db7aa21ef58589e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-225.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-225.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.9",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-226.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-226.json
index 66836d4a35a6db064b444ce1ce0eb2be63f9b76e..6e69ec0ccbd44614f11a350b01fd893c44130ab8 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-226.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-226.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.10",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-227.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-227.json
index 06b8cc53ca0487f6d6c0bf8e218cf732c9b5eddb..e844a064d4e4530f58b847336b42d2922e2d9f73 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-227.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-227.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.11",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-228.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-228.json
index 5f0ef2d95f23cd2915c2363043be13cd5d6ec64c..3e7e3dbfb31fd5b6484c25a36151b3ec5baad248 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-228.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-228.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.86.12",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-229.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-229.json
index 14b5c896bec9e7fe02d3784c11c436b619645fde..44a225c5a9799cda8f1552ea7c259b299ce4d5c9 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-229.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-229.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.13",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-23.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-23.json
index e4cb05d3b9e635b8473236d9ea41a1062ba3c7d3..d9cd551f757a99ecdfdd69695f8eb4fd19edbd34 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-23.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-23.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.23",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:8F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-230.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-230.json
index ad34ee607d11d9fa30c63e95aea2931bc9fd5e76..0e9b73f037c25479bc9d881a5a7ed0f22a8fc6dd 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-230.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-230.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.14",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-231.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-231.json
index ad86ac41794f2e88783a2f983e710b0bc1a4790c..f2906ac1bd94af534afae0ec7ccbcc517f6fc127 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-231.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-231.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.15",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-232.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-232.json
index da52b6a7ec506be9322015aa85e8e81099335cbc..0a753c887adb5b48d038c3b713e06cd7d564fe56 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-232.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-232.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.16",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-233.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-233.json
index 353f3ca8065e2e51f9c038174828d07b751d337a..e9328c86bdb420f2431df33eb37146fe4cfd262f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-233.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-233.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.17",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-234.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-234.json
index 2436022223eca752fe4af755a783ddf6f500e706..94b0d67b67b227d73428a2703a84f5fa9629cc4a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-234.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-234.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.18",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-235.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-235.json
index 1b6441db3365b554e62e2c78132a9a5439c25061..322dcc01ab269acfe254c5841e71347fcab8f20b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-235.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-235.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.19",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-236.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-236.json
index 4be4ad6ab8bf14031f3c214e9ed1c8b5fb3e37aa..d5fbc6a4a909fb14393eccb666388766f287ac2d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-236.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-236.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.20",
-      "mac": null,
+      "mac": "00:60:DD:47:89:D1",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-237.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-237.json
index f4ec445abffc4f71043c0f1055af4c286c77d2bc..617f48dfe50a0c2e35cc60e6b5836ca3cfc3b1f7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-237.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-237.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.21",
-      "mac": null,
+      "mac": "00:60:DD:47:89:CF",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-238.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-238.json
index 835fe0dc2ad91af870e21108d1237ba3c47567f2..afb278fc8a4c11f6ded7d69b3506babbb3cac808 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-238.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-238.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.22",
-      "mac": null,
+      "mac": "00:60:DD:47:7D:7D",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-239.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-239.json
index 4950e3318b70e8ac368700acf65a0c11e7742abc..57e069841efa5b49d8a871cd2d1f36629d74c49b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-239.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-239.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.23",
-      "mac": null,
+      "mac": "00:60:DD:47:7D:97",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-24.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-24.json
index 52035dd9acb8682444814b88af187f1fbdb3e769..159492f6877eec31313328792f0aaea083c25a14 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-24.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-24.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.69.24",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:57",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-240.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-240.json
index 36bc71fc9728d79c34f55520e091009e1ee41660..709d69321ff51f67c45fa022ffddbdf8d4c55759 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-240.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-240.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.87.24",
-      "mac": null,
+      "mac": "00:60:DD:47:7D:7C",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-241.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-241.json
index 5879c65977c9d34717f901feb9ba652e387c6792..efef6b48ac308cf34861c59e031dedd588093395 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-241.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-241.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.25",
-      "mac": null,
+      "mac": "00:60:DD:47:7C:D4",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-242.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-242.json
index 40b0713f12057bae1201452d1a5cdede95c9459c..c312fcd9cbc24e97f6b992f2faf1db834222a249 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-242.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-242.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.26",
-      "mac": null,
+      "mac": "00:60:DD:47:7C:C8",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-243.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-243.json
index 1067cdc80e3b707148410f7f83c7341989356e22..99ac8fff319f25d34ad5ae8444ecc8afb1e3ede8 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-243.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-243.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.27",
-      "mac": null,
+      "mac": "00:60:DD:47:7C:07",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-244.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-244.json
index 431c9145056505fcf0544c94a975aaa2a7e0bc90..dd70516f23c4e6402e73ca85d5b949293d2cc46d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-244.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-244.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.28",
-      "mac": null,
+      "mac": "00:60:DD:47:89:07",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-245.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-245.json
index e9e2e1c5c9c349eb0ddbbb13b1a9a70a4c19e011..69aacbe018eec02df4e88096a55997827bccc9ba 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-245.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-245.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.29",
-      "mac": null,
+      "mac": "00:60:DD:47:7B:FE",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-246.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-246.json
index 25d27f54fbe454d4406fd6ce934d5bbd5d304cfd..14dd16d579ad1d04af439fa0e5e94d7c724a8922 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-246.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-246.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.30",
-      "mac": null,
+      "mac": "00:60:DD:47:86:58",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-247.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-247.json
index 7780c98b4fcb3a5496ba44ca6076baa302eefe91..094375bb5a637100794089ff58ca17f518ad68e8 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-247.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-247.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.31",
-      "mac": null,
+      "mac": "00:60:DD:47:7B:FD",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-248.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-248.json
index 200a0a1fe8b5fe2834e61448737d922e333ea583..cd16a88eee28d9e0fc158a176a19a45a3c856f01 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-248.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-248.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.32",
-      "mac": null,
+      "mac": "00:60:DD:47:7B:FC",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-249.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-249.json
index 0b9b4771ae655d3fd4ee26c2e19fb7683be2b9bb..94035183ef8316ceab0b3a932427b755457f607a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-249.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-249.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.33",
-      "mac": null,
+      "mac": "00:60:DD:47:88:62",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-25.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-25.json
index 2780a976fd20ca42738fc299d04d058a8e62dc88..2b84da07054db27c56667fb884062f3adc4a4e65 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-25.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-25.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.25",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-250.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-250.json
index 2f9aca58a824cb9890732a0fc579d0f69611d44f..138f1a9796b7721e6c79d51ac8b1ba509c4cc799 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-250.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-250.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.34",
-      "mac": null,
+      "mac": "00:60:DD:47:7B:FF",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-251.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-251.json
index a780eff417672645dae885aaa27a8d718c346514..2e760d90336d865614cab5e7f187ebefbdbe4124 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-251.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-251.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.35",
-      "mac": null,
+      "mac": "00:60:DD:47:88:6E",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-252.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-252.json
index a109d785740905924cbbf0eaf86ef7ec1f9c8546..ca1cba97ce97ded9795ba98b6d4e75c8f1ba09c3 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-252.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-252.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.88.36",
-      "mac": null,
+      "mac": "00:60:DD:47:7C:65",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-253.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-253.json
index 137085d1435c8513497a57289b80f79615593ba2..c36a2e5d30477a1dc2fc30983d28d1e9681dc180 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-253.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-253.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.1",
-      "mac": null,
+      "mac": "00:60:DD:47:C7:FB",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-254.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-254.json
index c880f54797c67a7f6ec6531ca92bdf08b599a574..184cde91405dd46d725ef8f6e831b15e7cc00330 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-254.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-254.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.2",
-      "mac": null,
+      "mac": "00:60:DD:47:C7:FE",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-255.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-255.json
index 45c05aeab3c71050511177e1ad00ef16dcc74019..bfe095e28dbc6f8dcc0dd355dc5c28c714a76d45 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-255.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-255.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.3",
-      "mac": null,
+      "mac": "00:60:DD:47:7C:E1",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-256.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-256.json
index ddb2c7c0425393c5c8613790967b000b60f7c224..f3edfa947b1f11d9f5e33373c73e64bdf7c3d72e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-256.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-256.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.4",
-      "mac": null,
+      "mac": "00:60:DD:47:88:FA",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-257.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-257.json
index 92f597bda9c2b82afe4d09331fb6f3a338fe0fd7..493bb955c96cba20b2970fe949aa02f1e8c2d18d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-257.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-257.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.5",
-      "mac": null,
+      "mac": "00:60:DD:47:C7:F6",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-258.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-258.json
index c2480dddc46aa9a8bbfb729ce5f1b7a9a8595ba8..8da953ef0fb6c79c50aa4e8d4df4a95bc3c12560 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-258.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-258.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.6",
-      "mac": null,
+      "mac": "00:60:DD:47:7D:7F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-259.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-259.json
index 2d6fa1d6a0387819a72aad9d708d587001e76cbc..1deb5832e596be37dd815100af4fd8c56c577bd4 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-259.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-259.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.7",
-      "mac": null,
+      "mac": "00:60:DD:47:88:FF",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-26.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-26.json
index 8ba08f83de2f39d7c74c2ff303dff80c57b916bc..67619928bd34c79565b13a31286553d11c2435dc 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-26.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-26.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.26",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:59",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-260.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-260.json
index cc261c48725b37207f7fd44cf24f484450d52072..2fe791de0f63db6bf24d7a1a7b87a058239a17e0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-260.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-260.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.8",
-      "mac": null,
+      "mac": "00:60:DD:47:7D:B0",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-261.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-261.json
index 18bbb86a13478d5c1c90136c0cfc2db4b612e929..599b6a3edcb37dbdcf7f846ec6dc3a3a69a402e0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-261.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-261.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.9",
-      "mac": null,
+      "mac": "00:60:DD:47:88:F8",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-262.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-262.json
index 32cbd4d0d70c2ff78d9ef264e69bb5beb33d31e8..1c61beae0f50d362b7ad3fea891973904738aecd 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-262.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-262.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.10",
-      "mac": null,
+      "mac": "00:60:DD:47:7D:11",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-263.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-263.json
index 49a247b307cf9eaf3312a7b5ba1823a01d4f7ac7..f2a66e615b8429669162ae40f2b54e4569b6494e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-263.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-263.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.11",
-      "mac": null,
+      "mac": "00:60:DD:47:89:C5",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-264.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-264.json
index 05be63bd98bb20093bb2b780b372e04fbf534011..6ff291528f6295612225f3274341bedb92fddc33 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-264.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-264.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.89.12",
-      "mac": null,
+      "mac": "00:60:DD:47:89:CA",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-265.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-265.json
index 78d445ca2d90ddaecfb54f380033c6b599d43543..4e1827145432cff453d91c33ee01328f698f53d5 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-265.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-265.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.13",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:1F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-266.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-266.json
index 55974c956250b44c6294e0958ed606ba5a4819d0..48e71b3175d9c1c047f65e492f774f309b6414c0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-266.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-266.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.14",
-      "mac": null,
+      "mac": "00:60:DD:47:89:8B",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-267.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-267.json
index 8230115fda1a2b9e0c82bc09df2aa5d205f9bc1b..3435247fe3c936b046738342ef3ff05175d800e2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-267.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-267.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.15",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-268.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-268.json
index 0ad6bff72b92eb2b6235d65d66641e6be086e89d..c76bb174a87b6fad577bdd7d77fa747f058e842a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-268.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-268.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.16",
-      "mac": null,
+      "mac": "00:60:DD:47:89:C7",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-269.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-269.json
index dc5734f18f581d1a49ba8c1a5e0429949966468f..9aae0fd827e3199dcd4f3256d448993b8e9c6d57 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-269.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-269.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.17",
-      "mac": null,
+      "mac": "00:60:DD:47:89:C9",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-27.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-27.json
index 19389f99ba534c63120537bf50d9d03491c76970..60cdb792b01bec6985c5c982178f37bceb8370ce 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-27.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-27.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.27",
-      "mac": null,
+      "mac": "00:60:DD:47:59:33",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-270.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-270.json
index 406e04c704aa92fde3866d4d23dacc8389183da2..85978b621644d63aab65daa4958062412d4b3bc4 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-270.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-270.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.18",
-      "mac": null,
+      "mac": "00:60:DD:47:89:C4",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-271.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-271.json
index c8100d3707aa3c355ce8eda465812befb1154ae6..b7d98199a5ae60f53c7efb1f2e08f2d1196b10fc 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-271.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-271.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.19",
-      "mac": null,
+      "mac": "00:60:DD:47:7C:CC",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-272.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-272.json
index bec1d48099d287bb588f09468cda0444a69caf0e..545afa9dcf542a63330e6b859ff854ea6c37a54e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-272.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-272.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.20",
-      "mac": null,
+      "mac": "00:60:DD:47:89:CE",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-273.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-273.json
index 368555714051c23b42f8e577e66d3d952305ff26..5cbc79b55baf55114cb2a1258369fff796da6fb9 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-273.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-273.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.21",
-      "mac": null,
+      "mac": "00:60:DD:47:89:C8",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-274.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-274.json
index f4d758f11d6cdb83d52a05199345d545b44e41cd..9b01fc8b2ab034200e1b29dbd183bf8a393b747b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-274.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-274.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.22",
-      "mac": null,
+      "mac": "00:60:DD:47:89:D2",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-275.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-275.json
index c0abc1fb69140b61d58b215b16f26053e5286828..17c841874ba7a7b2bfaa6ec33f420b70eea0d10b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-275.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-275.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.23",
-      "mac": null,
+      "mac": "00:60:DD:47:89:90",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-276.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-276.json
index e9e1540b24fae8885fbd69fc33db065188e7da73..bb726c099fe3c418ec6a78d70fb520fe95be6ad9 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-276.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-276.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.90.24",
-      "mac": null,
+      "mac": "00:60:DD:47:89:0D",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-277.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-277.json
index a2aa9cfb9cfbbeb34bcc073a9f6e0a6acabe47f8..794bb09a540f2fa2a5bb465fa934d51425cc9068 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-277.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-277.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.25",
-      "mac": null,
+      "mac": "00:60:DD:47:89:87",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-278.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-278.json
index 76dd824bb14adbce8d5000610f559159abd4a2d5..7d38d129e2b1a37e48924597cc3e9507690384ba 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-278.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-278.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.26",
-      "mac": null,
+      "mac": "00:60:DD:47:C7:3E",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-279.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-279.json
index c2a84f426702f82322627718bae5dd4ad760c37d..db0e98f130e8d81662c44e02191d820e4b297b78 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-279.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-279.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.27",
-      "mac": null,
+      "mac": "00:60:DD:47:C7:FD",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-28.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-28.json
index d28152013cc74c06c02a563786cfc7b657baad5e..333cb5f2604dce20370c6af82a6c436280f35e31 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-28.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-28.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.28",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:B6",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-280.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-280.json
index 4560fa7684641ff0cddc9e49cc8862f2361670c2..4dcc0f664fc1939683c9bf825acdd0fa85d3da1b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-280.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-280.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.28",
-      "mac": null,
+      "mac": "00:60:DD:47:C7:FC",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-281.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-281.json
index 71d9303020c1771f432da180efd8ca267d7d33e7..d7f1eb4a7d3c4f2deb0a28b4cac3ae7eecc80e86 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-281.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-281.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.29",
-      "mac": null,
+      "mac": "00:60:DD:47:C7:7D",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-282.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-282.json
index 773c4d46760a7a63b96740c8c467937c2f632bd3..9e10da26697cd896d3437f2b0a28a667147b33b3 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-282.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-282.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.30",
-      "mac": null,
+      "mac": "00:60:DD:47:89:1C",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-283.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-283.json
index 7f096d6b145751a7490927a003306c17697d492a..0145ca705e72f391df1da60f50ece44bc278544b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-283.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-283.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.31",
-      "mac": null,
+      "mac": "00:60:DD:47:89:86",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-284.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-284.json
index 5d89f12a721dcb6f6c833c272a9f0abc96a8204f..0754e15ef589d1a349272f7d186f33e701f5b6f5 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-284.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-284.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.32",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-285.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-285.json
index 2329f24cc7a23e9b72de5eb9285fccd1574316a2..e1c483e4fdffcad27fd74b4b8762921f0f1b0bee 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-285.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-285.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.33",
-      "mac": null,
+      "mac": "00:60:DD:47:89:CC",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-286.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-286.json
index 345581267b53ed259f1dc6c221b03593b4ddbc43..3edc6aa5b35f4ef6474846cac9d4e06ffe20c328 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-286.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-286.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.34",
-      "mac": null,
+      "mac": "00:60:DD:47:89:C2",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-287.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-287.json
index c821bd3b12a3a1d40fd6c07b80494f8cea5ad20e..e7132c7549862a602c5c295ebef919a3d2b70cc2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-287.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-287.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.35",
-      "mac": null,
+      "mac": "00:60:DD:47:89:C6",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-288.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-288.json
index 8615096f8559076d4dc999d1cb96fcd6da50dbe3..69e9f53f61767be671bab0144063497fef79308a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-288.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-288.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.91.36",
-      "mac": null,
+      "mac": "00:60:DD:47:89:CD",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-289.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-289.json
index 0565ea8c261ae5a191d609b680c41f7378f5b9ac..e2dcdaa1a58c1b94fbf49a3aaa1cc15b9fbbddee 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-289.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-289.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.1",
-      "mac": null,
+      "mac": "00:60:DD:47:89:1D",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-29.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-29.json
index 518e6cb30e1927d3e5b0db943270bec784ad559a..e31eb195d67a1a4326aa0ba2d94fd31e9ddc472f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-29.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-29.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.29",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-290.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-290.json
index 4c4011c6cf9468ef64abac4d23cb3a873352e32f..0cf0d455f6ee67057da463e7650de306b23e2b27 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-290.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-290.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.2",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-291.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-291.json
index e78c7e715a1b89d8d48031cbd55169ff39fd6282..09882612c02d1a544f4877525d07c43b214f3d85 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-291.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-291.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.3",
-      "mac": null,
+      "mac": "00:60:DD:47:C7:FA",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-292.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-292.json
index 69f4cb1e5afbfcfede0e8dfaae4c4516df329f6c..5c64952ac15888476c0b8c31a288588e610984d2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-292.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-292.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.4",
-      "mac": null,
+      "mac": "00:60:DD:47:C7:FF",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-293.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-293.json
index 52e98a58493f193957ca95564f295c1f1119859c..c6569cefb91cd1175998a596d44a39ac888f41f7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-293.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-293.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.5",
-      "mac": null,
+      "mac": "00:60:DD:47:89:13",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-294.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-294.json
index 71185c3caf212a9ab90545967860c87c93bfc6ef..355e77da8a7f2d7acc49d902f0f1ca9f262e68b8 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-294.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-294.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.6",
-      "mac": null,
+      "mac": "00:60:DD:47:89:78",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-295.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-295.json
index fa0496638571c475e0a06c2e00bf952f901cb9f5..0d4e599b0df730933eb39240b105e2f5d5ee63e3 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-295.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-295.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.7",
-      "mac": null,
+      "mac": "00:60:DD:47:89:88",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-296.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-296.json
index 78c553aad92826865cb831eebe7e2951ea02e513..ea0bb9bd5b616bd7f0da160951faf7fbd85395b0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-296.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-296.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.8",
-      "mac": null,
+      "mac": "00:60:DD:47:89:B1",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-297.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-297.json
index fa7ebbad4f9fd853d6946beb21f8ed35986db864..70ee41d56241727290660578b60d688569a6f6d7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-297.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-297.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.9",
-      "mac": null,
+      "mac": "00:60:DD:47:89:85",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-298.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-298.json
index 9f04a068ae192c43e3531fb48f0a114541cfc59c..916d71793d16b30e2b34bf0eef27ef408824e940 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-298.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-298.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.10",
-      "mac": null,
+      "mac": "00:60:DD:47:89:95",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-299.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-299.json
index d7a6a45dae589e6f98cba7b28ffc83f67792884b..39884bddbc5ed405803baa6b6e73bfb607c0c2e8 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-299.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-299.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.11",
-      "mac": null,
+      "mac": "00:60:DD:47:89:0E",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-3.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-3.json
index 02f70776f27a6053a196b6a4ae02a3986430bdac..504af85d9a1fc5f941e4ad292c75875f4373b9e5 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-3.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-3.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.3",
-      "mac": null,
+      "mac": "00:60:DD:47:59:76",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-30.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-30.json
index 6356a5149fd6530876f59ed7e0e4900b1966c055..df288f4d10f1d47c78c2176a20e18cb55adc95ae 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-30.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-30.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.30",
-      "mac": null,
+      "mac": "00:60:DD:47:65:DE",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-300.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-300.json
index 5c43b0dff58fccb7a3575e61de6abe94d6232ed2..ec0c35755276350f5e57983a8293e6c28e592bbf 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-300.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-300.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.92.12",
-      "mac": null,
+      "mac": "00:60:DD:47:89:1B",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-301.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-301.json
index 0cd44ee5581020bea6ddf7795f89cd779c86da83..201fb2433f0611e10e1ed85b655dcb092d24f823 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-301.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-301.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.13",
-      "mac": null,
+      "mac": "00:60:DD:47:89:93",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-302.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-302.json
index 0fceae0f60dc626825befc0ca2ec2c4c30148be2..75040cb74385b2ad64f8d636353fd4d51824705d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-302.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-302.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.14",
-      "mac": null,
+      "mac": "00:60:DD:47:89:83",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-303.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-303.json
index ab463f7359f8c4bc3b3c18d04b9831f9afe9b655..d91db625ee5dda8fb710597aa9d7fb509c6029d8 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-303.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-303.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.15",
-      "mac": null,
+      "mac": "00:60:DD:47:89:7D",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-304.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-304.json
index fe86a662112b50012cc4580a83c6329f282a806f..c376872e4827a29dd1c46e6343d736451d65bb41 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-304.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-304.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.16",
-      "mac": null,
+      "mac": "00:60:DD:47:89:8F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-305.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-305.json
index 3dafd912e5522c7db15c7571b189a5627f8384c3..a9ecd1849419a55eeb7ea30c7339b923996a907c 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-305.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-305.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.17",
-      "mac": null,
+      "mac": "00:60:DD:47:88:B0",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-306.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-306.json
index b67f38ff14a900f3887065f30ee3fd8792ab9171..46990a70465730a0a373c2c64b9c16895a4b4048 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-306.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-306.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.18",
-      "mac": null,
+      "mac": "00:60:DD:47:89:96",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-307.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-307.json
index 22a8e7797b741233ae192c2fc6c9006423af121f..14612c35b75e3fcc3fd60d2d61e624e4f7acb77f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-307.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-307.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.19",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-308.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-308.json
index c12cae7d14a03ff91b91c31d18f8e608a9047ce2..de25c49f85a3f703c43ef26b1ce88cd84576a5b2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-308.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-308.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.20",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-309.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-309.json
index 7879f74d6ed7e068286fbb6ca769b334ddd00cec..01691073d7269ec9622a1cd211590178cc632623 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-309.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-309.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.21",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-31.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-31.json
index b56c3872778e4e7c6df1dee9301000c97b88e894..ec9220958f446217b5f8e310f4b0b3116b208fd4 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-31.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-31.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.31",
-      "mac": null,
+      "mac": "00:60:DD:47:59:69",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-310.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-310.json
index 6e0b02f97deb0c2e14f8b5f1176cd5c38d878937..48fc10313f473da85092d9a55b196197cbe0d36c 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-310.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-310.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.93.22",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-32.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-32.json
index fa7921fed453193b708c091627df9ee239b592fc..36afbb8e6f66c78828c72deddb3ec58d373348cd 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-32.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-32.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.32",
-      "mac": null,
+      "mac": "00:60:DD:47:65:B7",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-33.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-33.json
index cf8fb062fd63495a0733f05875bd2760fadb4045..404f38f4a19571eab79051f8f878e1f2f56207e0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-33.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-33.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.33",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:20",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-34.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-34.json
index 4b878ddd0252f4e1d2063596858b931beafdbe35..278283bec00eac4a85e4f4207d42cdde38b1e3af 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-34.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-34.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.34",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:91",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-35.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-35.json
index 2798d9101c6fe4a66118ecd6229c44f19773e2f8..0fb0061cecb6a11d28a136bd8e06e9ec33c62049 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-35.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-35.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.35",
-      "mac": null,
+      "mac": "00:60:DD:47:65:BB",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-36.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-36.json
index b56a015e0e816f9de7e517db8558009ec0770b07..e0b7df565cbef467dd4581ddb31c67644158218f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-36.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-36.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.70.36",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:90",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-37.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-37.json
index 5581e9ece9c4e1789e5292727ae6c6749e1ac5e9..b1cd33c9b174f862af5f065b2d094e564d7d4b90 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-37.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-37.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.1",
-      "mac": null,
+      "mac": "00:60:DD:47:59:AA",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-38.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-38.json
index 127001a651fb78fc8f7732847f637caa0293f285..d648bae9f6d906426b420de45481e865838a2d6d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-38.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-38.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.2",
-      "mac": null,
+      "mac": "00:60:DD:47:59:B1",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-39.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-39.json
index 885e936a3f988df6bf1eeee4cdcff9626f93c775..e2397808a0d3ec37fcabcce67528db00012a8a30 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-39.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-39.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.3",
-      "mac": null,
+      "mac": "00:60:DD:47:59:71",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-4.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-4.json
index ececa24aaaa2c4634ad39eb8127f6362085dcb46..b8af5a809fc4730063a040919650433ae6aa5039 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-4.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-4.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.4",
-      "mac": null,
+      "mac": "00:60:DD:47:59:74",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-40.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-40.json
index 9eb7c0bf93c79a48c78386c04bdab201b4624ef3..c188ff0ee58b3449c699ee4961277146c9d343f8 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-40.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-40.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.4",
-      "mac": null,
+      "mac": "00:60:DD:47:68:87",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-41.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-41.json
index 81fe964e10f3c2765f5bae8df2761d6eee398193..cf3c4ec5f849fff376f3288ca68537f962c363c5 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-41.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-41.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.5",
-      "mac": null,
+      "mac": "00:60:DD:47:59:04",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-42.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-42.json
index b2e547c6d8428414970fa85973d67008e98c041d..f5084a883641caf8478e174708aec41311282def 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-42.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-42.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.6",
-      "mac": null,
+      "mac": "00:60:DD:47:67:94",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-43.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-43.json
index d5dcf8edfe1ef0565be43c6ad626798dc84c7965..bf313c5de6d0e4375ef28368469099f3242d3c52 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-43.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-43.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.7",
-      "mac": null,
+      "mac": "00:60:DD:47:59:05",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-44.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-44.json
index 354f54d403d486e431801fc22215a0fb8f56fe2f..2aea3656839d1feb2f4d89fb2b45aebf6b5e2cce 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-44.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-44.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.8",
-      "mac": null,
+      "mac": "00:60:DD:47:59:00",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-45.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-45.json
index 823ea91eac81198f0ce037776d03316f053ca60e..e19d168b119ffe425bca0bb0adcb0e7cf9064d5a 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-45.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-45.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.9",
-      "mac": null,
+      "mac": "00:60:DD:47:59:A3",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-46.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-46.json
index a2fabd8f1f24d296b9d60d731245b89ca1f73289..d330dec1467a9d3f0139c3d4637fe94829161bd7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-46.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-46.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.10",
-      "mac": null,
+      "mac": "00:60:DD:47:65:DB",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-47.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-47.json
index ce3e70a2f7209d26348b8c5a8a34250f8954bcb0..6265ccfef32ca652c9a5f38373351f24ba06e134 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-47.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-47.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.11",
-      "mac": null,
+      "mac": "00:60:DD:47:58:F6",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-48.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-48.json
index e892bf6fd0d86576fbb7e4fc9417d9a3829333d3..b13bf25ca3dcceba7321ee80667c2905e8484f31 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-48.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-48.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.71.12",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:85",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-49.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-49.json
index d1a0ef68bab899848dc44038e55aced0b8701754..b60ff95c3246036201dcb6dd5e733dd468c3c97e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-49.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-49.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.13",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:80",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-5.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-5.json
index bd97d69838c8fc9a095ad29584b1aefa4aeb8773..a836ba9a3f50161c08d345beb0166e00ccf288af 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-5.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-5.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.5",
-      "mac": null,
+      "mac": "00:60:DD:47:59:68",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-50.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-50.json
index 636387ef0bbb1b72bd0f8f4b240bdb469bd92ed4..ccd13ae3cfe3bf22dc0d40ddc5f0553a9cda0300 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-50.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-50.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.14",
-      "mac": null,
+      "mac": "00:60:DD:47:67:92",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-51.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-51.json
index 54cdb55a2b9705dc0b8add0e342a32d796656aab..e7b10856d58cc1549ae53556729ba4f2d301a4c7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-51.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-51.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.15",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:8D",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-52.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-52.json
index 5607a2bba65e4229ca0e7ab1ed584032181066fb..751f534c08f1762b4b4367afd877ff4cf09361b4 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-52.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-52.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.16",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:7C",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-53.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-53.json
index bfa2d7135c1e2e24dd39a9974696210d9d857585..e9135788cb21fa06a9a76ca65c28da07f929f539 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-53.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-53.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.17",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-54.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-54.json
index c0d51555673b463161509222cf36cf72237f8c80..ac81040cb1baf3fc34d625d1d05fb431f93d17e7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-54.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-54.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.18",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:84",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-55.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-55.json
index 0ae8e9d0462f68e54f0b90416fa3357028c4b8e8..a2345727417704c64a6d6c90a60d227a72738927 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-55.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-55.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.19",
-      "mac": null,
+      "mac": "00:60:DD:47:59:6F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-56.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-56.json
index fa5e59ceed876ea3fedf739d68a343caf131f6bc..be4e50f7fe56be1ca4ffa950de2a86000d1372d2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-56.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-56.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.20",
-      "mac": null,
+      "mac": "00:60:DD:47:59:40",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-57.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-57.json
index 22187f8a404257b1428415b5a3d8e2b86cc7f779..9a43800c0c67260e90deed04d0475567876fa263 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-57.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-57.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.21",
-      "mac": null,
+      "mac": "00:60:DD:47:88:43",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-58.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-58.json
index d755c747ece62b77add17dc1c523999c16050a0c..ffb3bc5a355d62cafea98cde25e5e75edf53c2f7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-58.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-58.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.22",
-      "mac": null,
+      "mac": "00:60:DD:47:68:42",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-59.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-59.json
index 9c930dc9f19fc42e5ab76015ce0e20dab8850d5e..083072b8e1695807bfc88a74efb6144899154402 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-59.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-59.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.23",
-      "mac": null,
+      "mac": "00:60:DD:47:67:89",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-6.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-6.json
index da0b41c6fc8c9f5f6f474c72e3bf83ac0452f34f..4e17994e35b3f96edd35439219aef0209f60757d 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-6.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-6.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.6",
-      "mac": null,
+      "mac": "00:60:DD:47:59:77",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-60.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-60.json
index 40389695094886c5dd505811caf1db40d4e5cf4e..8bfbe0e99a73b3421b75e45001a65c9b5b4e150b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-60.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-60.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.72.24",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-61.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-61.json
index 72b6b7fb05ae531e329572ecb6d8a6f5a633f18f..560aee1cbcb819784056e1a8cdac4e950175c82f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-61.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-61.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.25",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-62.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-62.json
index c5099f092296cb1ac9db6d6e5a616df6acb77c30..e450c14dd7cc5baba2c5b1bbb0bf851a333f3621 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-62.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-62.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.26",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-63.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-63.json
index 947b1cd459df1039eb3461d0cca1a2363e1f1252..232e73557ce43d802c7adf5e7bbd111cfc70b067 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-63.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-63.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.27",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-64.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-64.json
index 60d23d38dbe960645d273382d3eb99913a201a69..bb859296156664f86762226184eea655c3285a5c 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-64.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-64.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.28",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-65.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-65.json
index 357cdce2042c95e49cefe307317405f1be5b253e..3cc2d2ca007bed5dfc6cab737fd52dc264f4d552 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-65.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-65.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.29",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-66.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-66.json
index c2d629c655e073602a37637c36caf7e880fcbe88..f4f59b141b38a26f6228877ce72459daf4dba5f5 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-66.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-66.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.30",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-67.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-67.json
index b3de53c40cb7196848d8f2d848bfc4b9ebfe4174..aa74b5bd77866b6de3a53182c8c45ef4b3f0a4af 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-67.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-67.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.31",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-68.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-68.json
index afe4e379d826be867be83db72c749f645ce00135..52f785016835561cd5feef4a6f4d50bb447c1276 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-68.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-68.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.32",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-69.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-69.json
index d684db5bab1266c2b03209792d75c1385ad1284d..f4b062bea3fbd1f80d94409f5f1244b0a534da69 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-69.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-69.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.33",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-7.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-7.json
index fa5cede3b2cafb70c2e68a59fcac3ba67360eb4a..c44e8a44ee609523bf91bd7469109a43536107c1 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-7.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-7.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.7",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-70.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-70.json
index c6a61eafe0b7e76c1b642de47e0fb476848bc4bf..7036d3f3a32308d533612a42b6bbed8a5cfaea76 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-70.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-70.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.34",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-71.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-71.json
index 94432947e5125a1a0073b7bb06789a4d9e1b46ed..03a1e6f5c085a910390d46a28c9a0e54fe574980 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-71.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-71.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.35",
-      "mac": null,
+      "mac": "00:60:DD:47:68:7F",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-72.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-72.json
index df343b2c4b4318b2cc706b6ec002f9d49860af1d..df36e03b75b4207da2c227d27e818a48bce29edc 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-72.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-72.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.73.36",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-73.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-73.json
index 4b4c55ed31255ea8d479551787cf4e79d678fad9..94e0fe83f6de3101565ebcbcca31a6a5b4988062 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-73.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-73.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.1",
-      "mac": null,
+      "mac": "00:60:DD:47:59:6D",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-74.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-74.json
index 10bf3393b818344d757e1c4fa59a983dfdb92eb3..be05efe5d25e14301cd88779797b48786b5c84b7 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-74.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-74.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.2",
-      "mac": null,
+      "mac": "00:60:DD:47:59:73",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-75.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-75.json
index 42a1f0a43cad9f736169dff0cc1baa90396b5394..1b0beeb9035e5cc07ed40a6775fe7dae44409789 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-75.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-75.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.3",
-      "mac": null,
+      "mac": "00:60:DD:47:59:07",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-76.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-76.json
index 9efd4e39ea4550a78c4f83d992afaacf6036ed1f..071cab80b096853c6fe49b9cad8262ce3af50465 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-76.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-76.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.4",
-      "mac": null,
+      "mac": "00:60:DD:47:59:30",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-77.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-77.json
index 9b0750daaa42ae81c566d42f30d9f3a180fe0bcc..d1e4f423573bab4daf265bbd48b6b35951987ab2 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-77.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-77.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.5",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:7A",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-78.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-78.json
index 0ec0927622c66a04b520165f470a18dbeab4257a..e791fe0c0c47c154957a68aee0237e7c10c24198 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-78.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-78.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.6",
-      "mac": null,
+      "mac": "00:60:DD:47:59:06",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-79.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-79.json
index 0ec57197e46c15bc1918609f248b5137c690a870..51aef26ddada8eaf8b63a5ce85986af40e7b487f 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-79.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-79.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.7",
-      "mac": null,
+      "mac": "00:60:DD:47:67:97",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-8.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-8.json
index 8b31e703b7858ce137ffd74a5f58c068b9316ef2..1a326453c87290b36d4c594b33f4b187634ac1a6 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-8.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-8.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.8",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-80.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-80.json
index 633145345ec38f66d72af86e1bb5f8635d80c437..07ad17274cc3c2407b895b02fc995409292a3c37 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-80.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-80.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.8",
-      "mac": null,
+      "mac": "00:60:DD:47:67:95",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-81.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-81.json
index fe8a326e180161ccb799ed69c8b7177edc7715aa..e2b41888cefe0319bfe5c65c9e569a82ced42229 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-81.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-81.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.9",
-      "mac": null,
+      "mac": "00:11:25:C4:26:51",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-82.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-82.json
index c6d3038b77525e2d1ba574dc3e260c5076aadab0..9aabe6e77fc042baec8d51e90b4f15f80c137f94 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-82.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-82.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.10",
-      "mac": null,
+      "mac": "00:60:DD:47:59:A0",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-83.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-83.json
index 9e18920bd66e162c25ce46dcc95eb4f829bbdeb1..50d1a3c3b7dc814c4b39ba1e76777be59d792be0 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-83.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-83.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.11",
-      "mac": null,
+      "mac": "00:60:DD:47:5A:C8",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-84.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-84.json
index ff43330eea925fd9906007246e373ae16fedf975..819656d60b640497eaf62c475bed5dffa2b9efe9 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-84.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-84.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.74.12",
-      "mac": null,
+      "mac": "00:60:DD:47:65:A6",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-85.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-85.json
index f88e6830533803929088ca9f602863214ec7ac9c..2a5acf75986d9c6b755495030df1eb2a50d39f27 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-85.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-85.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.13",
-      "mac": null,
+      "mac": "00:60:DD:47:59:72",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-86.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-86.json
index a1ace87eb4c79eea1fe8df88d88f6d1cd4d458ae..38fdd01bc8cd0f14e2c3712276412b2489674690 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-86.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-86.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.14",
-      "mac": null,
+      "mac": "00:60:DD:47:59:6C",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-87.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-87.json
index 98663b95277d280d5197dd0c3e12fe9291158d81..e663b0e751ee60440c73389a68a7d0feaadd6543 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-87.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-87.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.15",
-      "mac": null,
+      "mac": "00:60:DD:47:68:81",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-88.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-88.json
index dac1ac0690cf7be682e7d9516026149d455ec193..3b53a5d4a7644ced5a75c411e41f7c131ce6a429 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-88.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-88.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.16",
-      "mac": null,
+      "mac": "00:60:DD:47:67:93",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-89.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-89.json
index b77e1804dc9f2476b621dc4a4840c6a3e30028e1..f8425b64bf444017195590e8c414e58fe0eee5e9 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-89.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-89.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.17",
-      "mac": null,
+      "mac": "00:60:DD:47:68:79",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-9.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-9.json
index 9f7da26e34c2c34145ef6a4ebf26c7e6f22119e6..61daeff315c95de8966ce2e9da7886196659e802 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-9.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-9.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.68.9",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-90.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-90.json
index 53d58c0840523c97559baf9f099f970e5bbd7fe2..ff6f5f6b3f24eb3416fcd73f0f8e22a0b863c7be 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-90.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-90.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.18",
-      "mac": null,
+      "mac": "00:60:DD:47:59:02",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-91.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-91.json
index 247c5a8d928b5c28cf015ecd7bb89693b0b61a9b..ae8152c35853b8432b97edc8b9acbad0f8425faf 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-91.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-91.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.19",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-92.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-92.json
index 61c501f3b9c3bba4e32d1285105617afa1fc12f1..a62e0a4c652a14617f042559a525dd8ec19f074b 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-92.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-92.json
@@ -35,7 +35,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.20",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-93.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-93.json
index f09568c865add496694119b8663867ca7649ab58..5d75fe870c08f6abb0e90203934d0a2ffdfe3f43 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-93.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-93.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.21",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-94.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-94.json
index e2be1a0a980ae1d746672a2ca65df49c67399223..083ead6f54743325382b89161c6cd22a225dfd75 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-94.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-94.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.22",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-95.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-95.json
index 70921a602c9523e6a6bd7533cc2934d72f5be658..75a741a3fa527ec98904a552edfb0b9f94f41aeb 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-95.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-95.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.23",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-96.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-96.json
index 0711b2a0ed706206d678bcd4977592be40679a39..e533dea2f1022268d3f543c8749612dc9651f107 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-96.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-96.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.75.24",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-97.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-97.json
index 75344b0471145d90db5a9ae3e6ea74cadcaf5df4..8ff5428c566a9d8e4c15e1f8db2cccecb813cb7c 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-97.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-97.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.25",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-98.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-98.json
index ad1ed904da9911f68db2f59dc219df1d03c9c135..f987e0159a3c18d44f00e79916ab3fd4a1852ec5 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-98.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-98.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.26",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-99.json b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-99.json
index 9497778d7711bdebb5a1deefe2d3dce83e277625..622ca854052465538c9846d3a2733212e92b584e 100755
--- a/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-99.json
+++ b/data/grid5000/sites/orsay/clusters/gdx/nodes/gdx-99.json
@@ -36,7 +36,7 @@
       "enabled": true,
       "interface": "Myrinet",
       "ip": "172.24.76.27",
-      "mac": null,
+      "mac": "nil",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/generators/input/orsay-gdx.rb b/generators/input/orsay-gdx.rb
index c5d59730ea59ad5a02fe022f260185d6cdb614d1..312346b668adde77bb2ec9cefc0fae1a4a0d41f9 100644
--- a/generators/input/orsay-gdx.rb
+++ b/generators/input/orsay-gdx.rb
@@ -83,7 +83,7 @@ site :orsay do |site_uid|
             :interface => 'Myrinet',
             :device => 'myri0',
             :rate => (eval switch_mx["rate"]),
-            :mac => lookup('orsay-gdx', "#{node_uid}", 'mac_mx'),
+            :mac => lookup('orsay-gdx', "#{node_uid}", 'mac_myri0'),
             :vendor => 'Myrinet',
             :version => '10G-PCIE-8A-C',
             :enabled => true,