diff --git a/data/grid5000/sites/toulouse/network_equipments/gw-toulouse.json b/data/grid5000/sites/toulouse/network_equipments/gw-toulouse.json
index 96abbc9aa6ffdc0280c3de157961cf4fac44cc03..e82c0ea57ed808ae22e901ab43564f70d4776039 100644
--- a/data/grid5000/sites/toulouse/network_equipments/gw-toulouse.json
+++ b/data/grid5000/sites/toulouse/network_equipments/gw-toulouse.json
@@ -342,6 +342,7 @@
     }
   ],
   "model": "Cisco WS-C6506-E",
+  "mtu": 9216,
   "routes": {
 
   },
diff --git a/data/grid5000/sites/toulouse/network_equipments/r4.json b/data/grid5000/sites/toulouse/network_equipments/r4.json
index 53d3a3462aa4f958ca5b319c133e0c080706c6eb..6eb5492802a1a97a2d03a6a6770dfa3cb4acc6d2 100644
--- a/data/grid5000/sites/toulouse/network_equipments/r4.json
+++ b/data/grid5000/sites/toulouse/network_equipments/r4.json
@@ -286,6 +286,7 @@
     }
   ],
   "model": "Cisco 7606",
+  "mtu": 9216,
   "routes": {
 
   },
diff --git a/generators/input/sites/toulouse/net-links/gw-toulouse.yaml b/generators/input/sites/toulouse/net-links/gw-toulouse.yaml
index 080f52c502f3a1261de81182ab764e684e166b72..75c79559f857278f85b6051fe2ce03f719940354 100644
--- a/generators/input/sites/toulouse/net-links/gw-toulouse.yaml
+++ b/generators/input/sites/toulouse/net-links/gw-toulouse.yaml
@@ -5,7 +5,7 @@ gw-toulouse:
   site: toulouse
   snmp_community: public
   routes: {}
-
+  mtu: 9216
   vlans:
     naming_pattern: Vlan%VLANID%
     "vlan100":
diff --git a/generators/input/sites/toulouse/net-links/r4.yaml b/generators/input/sites/toulouse/net-links/r4.yaml
index 519fd7239ae29bd95eaf3727a14bc8c31af94312..7d30b5a199fcfb8404777a6452fea8192655aea5 100644
--- a/generators/input/sites/toulouse/net-links/r4.yaml
+++ b/generators/input/sites/toulouse/net-links/r4.yaml
@@ -5,7 +5,7 @@ r4:
   site: toulouse
   snmp_community: public
   routes: {}
-
+  mtu: 9216
   vlans:
     naming_pattern: Vlan%VLANID%
     "vlan100":