diff --git a/data/grid5000/sites/reims/clusters/stremi/nodes/stremi-27.json b/data/grid5000/sites/reims/clusters/stremi/nodes/stremi-27.json
index fd7acad885b15228533cab1591605fa2e5d71b11..9a35664b78b805bfd788a2cb22c4072ef591deae 100644
--- a/data/grid5000/sites/reims/clusters/stremi/nodes/stremi-27.json
+++ b/data/grid5000/sites/reims/clusters/stremi/nodes/stremi-27.json
@@ -28,7 +28,7 @@
       "enabled": true,
       "interface": "Ethernet",
       "ip": "172.16.160.27",
-      "mac": null,
+      "mac": "1c:c1:de:e8:2b:0c",
       "mountable": true,
       "mounted": true,
       "network_address": "stremi-27.reims.grid5000.fr",
@@ -41,7 +41,7 @@
       "driver": "igb",
       "enabled": false,
       "interface": "Ethernet",
-      "mac": null,
+      "mac": "1c:c1:de:e8:2b:0d",
       "rate": 1000000000
     },
     {
@@ -49,7 +49,7 @@
       "driver": "igb",
       "enabled": false,
       "interface": "Ethernet",
-      "mac": null,
+      "mac": "1c:c1:de:e8:2b:12",
       "rate": 1000000000
     },
     {
@@ -57,7 +57,7 @@
       "driver": "igb",
       "enabled": false,
       "interface": "Ethernet",
-      "mac": null,
+      "mac": "1c:c1:de:e8:2b:13",
       "rate": 1000000000
     }
   ],
diff --git a/generators/input/reims-stremi.yaml b/generators/input/reims-stremi.yaml
index 273772257be8edbb041f7bc4b82ef1660e7f89bb..b67904426f2aab40c25439b84719420d4e5d6da8 100644
--- a/generators/input/reims-stremi.yaml
+++ b/generators/input/reims-stremi.yaml
@@ -422,14 +422,14 @@ stremi-27:
     eth0: 
       switch_name: gw
       switch_port: Unknown
-      mac: 
+      mac: 1c:c1:de:e8:2b:0c
       ip: 172.16.160.27
     eth1: 
-      mac: 
+      mac: 1c:c1:de:e8:2b:0d
     eth2: 
-      mac: 
+      mac: 1c:c1:de:e8:2b:12
     eth3: 
-      mac: 
+      mac: 1c:c1:de:e8:2b:13
 stremi-28: 
   network_interfaces: 
     bmc: