diff --git a/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-21.json b/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-21.json
index 82135032a96ba172e45d15772582fb897def8930..60524f0fbf95c0121436783bbc1059ff54aab90a 100644
--- a/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-21.json
+++ b/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-21.json
@@ -20,7 +20,7 @@
       "enabled": true,
       "interface": "Ethernet",
       "ip": "172.16.65.21",
-      "mac": "00:E0:81:B2:BF:CC",
+      "mac": "00:E0:81:B2:BF:C2",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-28.json b/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-28.json
index a478afbee706d822d9057348acecc1e32a0fd06f..01ea27593f3edbb4bcaf83da5dbae55e4183a35b 100644
--- a/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-28.json
+++ b/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-28.json
@@ -20,7 +20,7 @@
       "enabled": true,
       "interface": "Ethernet",
       "ip": "172.16.65.28",
-      "mac": "00:E0:81:B2:C0:E5",
+      "mac": "00:E0:81:B2:C0:5E",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-6.json b/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-6.json
index 5a01883692da598723e9a27a6832cd38f6978041..216a4cd01dfa48dd377d54daccacf0131fec3346 100644
--- a/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-6.json
+++ b/data/grid5000/sites/nancy/clusters/griffon/nodes/griffon-6.json
@@ -20,7 +20,7 @@
       "enabled": true,
       "interface": "Ethernet",
       "ip": "172.16.65.6",
-      "mac": "00:E0:81:B1:C4:E7",
+      "mac": "00:E0:81:B1:C4:7E",
       "management": false,
       "mountable": true,
       "mounted": true,
diff --git a/generators/input/nancy-griffon.yaml b/generators/input/nancy-griffon.yaml
index f5eac04857695159195e4194842414ab45103cd3..206f408b159802485d6c4172c0d8711064d9410f 100644
--- a/generators/input/nancy-griffon.yaml
+++ b/generators/input/nancy-griffon.yaml
@@ -221,7 +221,7 @@ griffon-6:
     ib1:
       guid: 20:00:55:00:41:80:00:00:00:00:00:00:00:02:c9:03:00:02:80:ae
     eth0:
-      mac: 00:E0:81:B1:C4:E7
+      mac: 00:E0:81:B1:C4:7E
       ip: 172.16.65.6
       switch_name: sgriffon1
       switch_port: Gi1/O/6
@@ -806,7 +806,7 @@ griffon-21:
     ib1:
       guid: 20:00:55:00:41:80:00:00:00:00:00:00:00:02:c9:03:00:03:30:50
     eth0:
-      mac: 00:E0:81:B2:BF:CC
+      mac: 00:E0:81:B2:BF:C2
       ip: 172.16.65.21
       switch_name: sgriffon1
       switch_port: Gi1/0/35
@@ -1079,7 +1079,7 @@ griffon-28:
     ib1:
       guid: 20:00:55:00:41:80:00:00:00:00:00:00:00:02:c9:03:00:03:2f:dc
     eth0:
-      mac: 00:E0:81:B2:C0:E5
+      mac: 00:E0:81:B2:C0:5E
       ip: 172.16.65.28
       switch_name: sgriffon1
       switch_port: Gi1/0/42