diff --git a/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.json b/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.json
index 15b7983d3279dbfee310796c97eca08bfef56fbf..abf5158404e88cd5ae935d2efdd143bbd76224fd 100644
--- a/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.json
+++ b/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.json
@@ -128,7 +128,7 @@
       "interface": "Ethernet",
       "ip": "172.16.72.28",
       "kavlan": true,
-      "mac": "24:6e:96:02:a3:c0",
+      "mac": "e4:43:4b:1f:c1:c8",
       "management": false,
       "model": "82599ES 10-Gigabit SFI/SFP+ Network Connection",
       "mountable": true,
@@ -148,7 +148,7 @@
       "firmware_version": "0x8000095c",
       "interface": "Ethernet",
       "kavlan": true,
-      "mac": "24:6e:96:02:a3:c2",
+      "mac": "e4:43:4b:21:59:4a",
       "management": false,
       "model": "82599ES 10-Gigabit SFI/SFP+ Network Connection",
       "mountable": true,
@@ -208,7 +208,7 @@
       "firmware_version": "1.67, 0x80000fab, 18.8.9",
       "interface": "Ethernet",
       "kavlan": true,
-      "mac": "24:6e:96:02:a3:c4",
+      "mac": "e4:43:4b:21:59:4c",
       "management": false,
       "model": "I350 Gigabit Network Connection",
       "mountable": true,
@@ -228,7 +228,7 @@
       "firmware_version": "1.67, 0x80000fab, 18.8.9",
       "interface": "Ethernet",
       "kavlan": false,
-      "mac": "24:6e:96:02:a3:c5",
+      "mac": "e4:43:4b:21:59:4d",
       "management": false,
       "model": "I350 Gigabit Network Connection",
       "mountable": false,
diff --git a/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-50.json b/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-50.json
index 71d81373d62068f2a7ed2cf4b7dff908d76e1982..23dc3ff00ad158eb6df62bb0bc0a8551961848ea 100644
--- a/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-50.json
+++ b/data/grid5000/sites/nancy/clusters/grisou/nodes/grisou-50.json
@@ -109,7 +109,7 @@
       "interface": "Ethernet",
       "ip": "172.16.72.50",
       "kavlan": true,
-      "mac": "24:6e:96:03:0b:a0",
+      "mac": "e4:43:4b:1f:c1:c8",
       "management": false,
       "model": "82599ES 10-Gigabit SFI/SFP+ Network Connection",
       "mountable": true,
@@ -129,7 +129,7 @@
       "firmware_version": "0x8000095c",
       "interface": "Ethernet",
       "kavlan": true,
-      "mac": "24:6e:96:03:0b:a2",
+      "mac": "e4:43:4b:1f:c1:ca",
       "management": false,
       "model": "82599ES 10-Gigabit SFI/SFP+ Network Connection",
       "mountable": true,
@@ -189,7 +189,7 @@
       "firmware_version": "1.67, 0x80000fab, 18.8.9",
       "interface": "Ethernet",
       "kavlan": false,
-      "mac": "24:6e:96:03:0b:a4",
+      "mac": "e4:43:4b:1f:c1:cc",
       "management": false,
       "model": "I350 Gigabit Network Connection",
       "mountable": false,
@@ -205,7 +205,7 @@
       "firmware_version": "1.67, 0x80000fab, 18.8.9",
       "interface": "Ethernet",
       "kavlan": false,
-      "mac": "24:6e:96:03:0b:a5",
+      "mac": "e4:43:4b:1f:c1:cd",
       "management": false,
       "model": "I350 Gigabit Network Connection",
       "mountable": false,
diff --git a/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb b/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb
index 4690c9568829c663fb660bc73bc2ef61d789eac9..6fe705051e01e66be218b30a78f685b22c9b6d6c 100644
--- a/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb
+++ b/input/grid5000/sites/nancy/clusters/grisou/grisou.yaml.erb
@@ -33,7 +33,7 @@ nodes:
                     24:6e:96:02:a7:d0
                     24:6e:96:02:a1:98
                     24:6e:96:02:a4:70
-                    24:6e:96:02:a3:c0
+                    e4:43:4b:1f:c1:c8
                     24:6e:96:02:a9:88
                     24:6e:96:02:a4:30
                     24:6e:96:03:10:f8
@@ -55,7 +55,7 @@ nodes:
                     24:6e:96:03:0a:40
                     24:6e:96:03:0d:50
                     24:6e:96:03:0e:80
-                    24:6e:96:03:0b:a0
+                    e4:43:4b:1f:c1:c8
                     24:6e:96:03:24:20
                    )[i-1] %>
 <% i61_111  = i + 60  %>
diff --git a/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.yaml b/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.yaml
index 2dad51183bc398287f5eafa5fde4298463260e38..19f45057960a22dfc762a6e50bd73f871e9718d5 100644
--- a/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.yaml
+++ b/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-28.yaml
@@ -26,7 +26,7 @@ grisou-28:
       firmware_version: '0x8000095c'
       interface: Ethernet
       ip: 172.16.72.28
-      mac: 24:6e:96:02:a3:c0
+      mac: e4:43:4b:21:59:48
       management: false
       model: 82599ES 10-Gigabit SFI/SFP+ Network Connection
       name: eno1
@@ -36,7 +36,7 @@ grisou-28:
       driver: ixgbe
       firmware_version: '0x8000095c'
       interface: Ethernet
-      mac: 24:6e:96:02:a3:c2
+      mac: e4:43:4b:21:59:4a
       management: false
       model: 82599ES 10-Gigabit SFI/SFP+ Network Connection
       name: eno2
@@ -66,7 +66,7 @@ grisou-28:
       driver: igb
       firmware_version: 1.67, 0x80000fab, 18.8.9
       interface: Ethernet
-      mac: 24:6e:96:02:a3:c4
+      mac: e4:43:4b:21:59:4c
       management: false
       model: I350 Gigabit Network Connection
       name: eno3
@@ -76,7 +76,7 @@ grisou-28:
       driver: igb
       firmware_version: 1.67, 0x80000fab, 18.8.9
       interface: Ethernet
-      mac: 24:6e:96:02:a3:c5
+      mac: e4:43:4b:21:59:4D
       management: false
       model: I350 Gigabit Network Connection
       name: eno4
diff --git a/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-50.yaml b/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-50.yaml
index 3f71081cdf26fe371bf7c8e29315c935b0cd35d2..2fe33777b349f25fc0522649918c5b5c7816a6e3 100644
--- a/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-50.yaml
+++ b/input/grid5000/sites/nancy/clusters/grisou/nodes/grisou-50.yaml
@@ -26,7 +26,7 @@ grisou-50:
       firmware_version: '0x8000095c'
       interface: Ethernet
       ip: 172.16.72.50
-      mac: 24:6e:96:03:0b:a0
+      mac: e4:43:4b:1f:c1:c8
       management: false
       model: 82599ES 10-Gigabit SFI/SFP+ Network Connection
       name: eno1
@@ -36,7 +36,7 @@ grisou-50:
       driver: ixgbe
       firmware_version: '0x8000095c'
       interface: Ethernet
-      mac: 24:6e:96:03:0b:a2
+      mac: e4:43:4b:1f:c1:ca
       management: false
       model: 82599ES 10-Gigabit SFI/SFP+ Network Connection
       name: eno2
@@ -66,7 +66,7 @@ grisou-50:
       driver: igb
       firmware_version: 1.67, 0x80000fab, 18.8.9
       interface: Ethernet
-      mac: 24:6e:96:03:0b:a4
+      mac: e4:43:4b:1f:c1:cc
       management: false
       model: I350 Gigabit Network Connection
       name: eno3
@@ -75,7 +75,7 @@ grisou-50:
       driver: igb
       firmware_version: 1.67, 0x80000fab, 18.8.9
       interface: Ethernet
-      mac: 24:6e:96:03:0b:a5
+      mac: e4:43:4b:1f:c1:cd
       management: false
       model: I350 Gigabit Network Connection
       name: eno4