diff --git a/data/grid5000/sites/lyon/clusters/hydra/hydra.json b/data/grid5000/sites/lyon/clusters/hydra/hydra.json
index fc534df7bfbdd2f9251eda96b56de8e836c53c66..88674027635a4ead0c87e4174bea9edfb4e53649 100644
--- a/data/grid5000/sites/lyon/clusters/hydra/hydra.json
+++ b/data/grid5000/sites/lyon/clusters/hydra/hydra.json
@@ -2,7 +2,7 @@
   "boot_type": "uefi",
   "created_at": "Thu, 15 Feb 2024 00:00:00 GMT",
   "exotic": true,
-  "kavlan": false,
+  "kavlan": true,
   "manufactured_at": "2024-02-15",
   "metrics": [
 
diff --git a/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-1.json b/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-1.json
index b0d5f89b4602898f8669f91d1029aef037a616d1..997baa5068ed0c31f0c44dfcf22d12da3116f1e2 100644
--- a/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-1.json
+++ b/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-1.json
@@ -20,6 +20,50 @@
     "warranty_end": "2027-02-15"
   },
   "exotic": true,
+  "kavlan": {
+    "eth0": {
+      "kavlan-1": "192.168.201.1",
+      "kavlan-11": "10.7.214.1",
+      "kavlan-12": "10.11.214.1",
+      "kavlan-13": "10.15.214.1",
+      "kavlan-14": "10.19.214.1",
+      "kavlan-16": "10.27.214.1",
+      "kavlan-17": "10.31.214.1",
+      "kavlan-18": "10.35.214.1",
+      "kavlan-2": "192.168.217.1",
+      "kavlan-20": "10.43.214.1",
+      "kavlan-21": "10.47.214.1",
+      "kavlan-3": "192.168.233.1",
+      "kavlan-4": "10.12.9.1",
+      "kavlan-5": "10.12.73.1",
+      "kavlan-6": "10.12.137.1",
+      "kavlan-7": "10.12.201.1",
+      "kavlan-8": "10.13.9.1",
+      "kavlan-9": "10.13.73.1"
+    }
+  },
+  "kavlan6": {
+    "eth0": {
+      "kavlan-1": "2001:660:4406:480:a::1",
+      "kavlan-11": "2001:660:4406:1a0:40a::1",
+      "kavlan-12": "2001:660:4406:2a0:40a::1",
+      "kavlan-13": "2001:660:4406:4a0:40a::1",
+      "kavlan-14": "2001:660:4406:5a0:40a::1",
+      "kavlan-16": "2001:660:4406:7a0:40a::1",
+      "kavlan-17": "2001:660:4406:9a0:40a::1",
+      "kavlan-18": "2001:660:4406:8a0:40a::1",
+      "kavlan-2": "2001:660:4406:481:a::1",
+      "kavlan-20": "2001:660:4406:3a0:40a::1",
+      "kavlan-21": "2001:660:4406:6a0:40a::1",
+      "kavlan-3": "2001:660:4406:482:a::1",
+      "kavlan-4": "2001:660:4406:490:a::1",
+      "kavlan-5": "2001:660:4406:491:a::1",
+      "kavlan-6": "2001:660:4406:492:a::1",
+      "kavlan-7": "2001:660:4406:493:a::1",
+      "kavlan-8": "2001:660:4406:494:a::1",
+      "kavlan-9": "2001:660:4406:495:a::1"
+    }
+  },
   "main_memory": {
     "ram_size": 515396075520
   },
@@ -45,7 +89,7 @@
       "interface": "Ethernet",
       "ip": "172.16.57.1",
       "ip6": "2001:660:4406:400:a::1",
-      "kavlan": false,
+      "kavlan": true,
       "mac": "a0:88:c2:98:fc:82",
       "management": false,
       "model": "MT2910 Family [ConnectX-7]",
diff --git a/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-2.json b/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-2.json
index 083c47ea6f6c577cb9286e351626de1eb42281e1..53d2a401b199b99f0a4ca91a5e65603cec92cf33 100644
--- a/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-2.json
+++ b/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-2.json
@@ -20,6 +20,50 @@
     "warranty_end": "2027-02-15"
   },
   "exotic": true,
+  "kavlan": {
+    "eth0": {
+      "kavlan-1": "192.168.201.2",
+      "kavlan-11": "10.7.214.2",
+      "kavlan-12": "10.11.214.2",
+      "kavlan-13": "10.15.214.2",
+      "kavlan-14": "10.19.214.2",
+      "kavlan-16": "10.27.214.2",
+      "kavlan-17": "10.31.214.2",
+      "kavlan-18": "10.35.214.2",
+      "kavlan-2": "192.168.217.2",
+      "kavlan-20": "10.43.214.2",
+      "kavlan-21": "10.47.214.2",
+      "kavlan-3": "192.168.233.2",
+      "kavlan-4": "10.12.9.2",
+      "kavlan-5": "10.12.73.2",
+      "kavlan-6": "10.12.137.2",
+      "kavlan-7": "10.12.201.2",
+      "kavlan-8": "10.13.9.2",
+      "kavlan-9": "10.13.73.2"
+    }
+  },
+  "kavlan6": {
+    "eth0": {
+      "kavlan-1": "2001:660:4406:480:a::2",
+      "kavlan-11": "2001:660:4406:1a0:40a::2",
+      "kavlan-12": "2001:660:4406:2a0:40a::2",
+      "kavlan-13": "2001:660:4406:4a0:40a::2",
+      "kavlan-14": "2001:660:4406:5a0:40a::2",
+      "kavlan-16": "2001:660:4406:7a0:40a::2",
+      "kavlan-17": "2001:660:4406:9a0:40a::2",
+      "kavlan-18": "2001:660:4406:8a0:40a::2",
+      "kavlan-2": "2001:660:4406:481:a::2",
+      "kavlan-20": "2001:660:4406:3a0:40a::2",
+      "kavlan-21": "2001:660:4406:6a0:40a::2",
+      "kavlan-3": "2001:660:4406:482:a::2",
+      "kavlan-4": "2001:660:4406:490:a::2",
+      "kavlan-5": "2001:660:4406:491:a::2",
+      "kavlan-6": "2001:660:4406:492:a::2",
+      "kavlan-7": "2001:660:4406:493:a::2",
+      "kavlan-8": "2001:660:4406:494:a::2",
+      "kavlan-9": "2001:660:4406:495:a::2"
+    }
+  },
   "main_memory": {
     "ram_size": 515396075520
   },
@@ -45,7 +89,7 @@
       "interface": "Ethernet",
       "ip": "172.16.57.2",
       "ip6": "2001:660:4406:400:a::2",
-      "kavlan": false,
+      "kavlan": true,
       "mac": "a0:88:c2:98:6c:a0",
       "management": false,
       "model": "MT2910 Family [ConnectX-7]",
diff --git a/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-3.json b/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-3.json
index 251ff78f60b26e0fc339d9dd154e054fc1acdd27..ee3c98fac53a5a1bdec3d314a1e0a5181fcc15c9 100644
--- a/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-3.json
+++ b/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-3.json
@@ -20,6 +20,50 @@
     "warranty_end": "2027-02-15"
   },
   "exotic": true,
+  "kavlan": {
+    "eth0": {
+      "kavlan-1": "192.168.201.3",
+      "kavlan-11": "10.7.214.3",
+      "kavlan-12": "10.11.214.3",
+      "kavlan-13": "10.15.214.3",
+      "kavlan-14": "10.19.214.3",
+      "kavlan-16": "10.27.214.3",
+      "kavlan-17": "10.31.214.3",
+      "kavlan-18": "10.35.214.3",
+      "kavlan-2": "192.168.217.3",
+      "kavlan-20": "10.43.214.3",
+      "kavlan-21": "10.47.214.3",
+      "kavlan-3": "192.168.233.3",
+      "kavlan-4": "10.12.9.3",
+      "kavlan-5": "10.12.73.3",
+      "kavlan-6": "10.12.137.3",
+      "kavlan-7": "10.12.201.3",
+      "kavlan-8": "10.13.9.3",
+      "kavlan-9": "10.13.73.3"
+    }
+  },
+  "kavlan6": {
+    "eth0": {
+      "kavlan-1": "2001:660:4406:480:a::3",
+      "kavlan-11": "2001:660:4406:1a0:40a::3",
+      "kavlan-12": "2001:660:4406:2a0:40a::3",
+      "kavlan-13": "2001:660:4406:4a0:40a::3",
+      "kavlan-14": "2001:660:4406:5a0:40a::3",
+      "kavlan-16": "2001:660:4406:7a0:40a::3",
+      "kavlan-17": "2001:660:4406:9a0:40a::3",
+      "kavlan-18": "2001:660:4406:8a0:40a::3",
+      "kavlan-2": "2001:660:4406:481:a::3",
+      "kavlan-20": "2001:660:4406:3a0:40a::3",
+      "kavlan-21": "2001:660:4406:6a0:40a::3",
+      "kavlan-3": "2001:660:4406:482:a::3",
+      "kavlan-4": "2001:660:4406:490:a::3",
+      "kavlan-5": "2001:660:4406:491:a::3",
+      "kavlan-6": "2001:660:4406:492:a::3",
+      "kavlan-7": "2001:660:4406:493:a::3",
+      "kavlan-8": "2001:660:4406:494:a::3",
+      "kavlan-9": "2001:660:4406:495:a::3"
+    }
+  },
   "main_memory": {
     "ram_size": 515396075520
   },
@@ -45,7 +89,7 @@
       "interface": "Ethernet",
       "ip": "172.16.57.3",
       "ip6": "2001:660:4406:400:a::3",
-      "kavlan": false,
+      "kavlan": true,
       "mac": "a0:88:c2:99:18:42",
       "management": false,
       "model": "MT2910 Family [ConnectX-7]",
diff --git a/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-4.json b/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-4.json
index 8ccbb1812f6e1f2f19f0b915ce12cfaa448866ad..cdfd0ef391abc915b0b6bcb1ceffcdb80edff057 100644
--- a/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-4.json
+++ b/data/grid5000/sites/lyon/clusters/hydra/nodes/hydra-4.json
@@ -20,6 +20,50 @@
     "warranty_end": "2027-02-15"
   },
   "exotic": true,
+  "kavlan": {
+    "eth0": {
+      "kavlan-1": "192.168.201.4",
+      "kavlan-11": "10.7.214.4",
+      "kavlan-12": "10.11.214.4",
+      "kavlan-13": "10.15.214.4",
+      "kavlan-14": "10.19.214.4",
+      "kavlan-16": "10.27.214.4",
+      "kavlan-17": "10.31.214.4",
+      "kavlan-18": "10.35.214.4",
+      "kavlan-2": "192.168.217.4",
+      "kavlan-20": "10.43.214.4",
+      "kavlan-21": "10.47.214.4",
+      "kavlan-3": "192.168.233.4",
+      "kavlan-4": "10.12.9.4",
+      "kavlan-5": "10.12.73.4",
+      "kavlan-6": "10.12.137.4",
+      "kavlan-7": "10.12.201.4",
+      "kavlan-8": "10.13.9.4",
+      "kavlan-9": "10.13.73.4"
+    }
+  },
+  "kavlan6": {
+    "eth0": {
+      "kavlan-1": "2001:660:4406:480:a::4",
+      "kavlan-11": "2001:660:4406:1a0:40a::4",
+      "kavlan-12": "2001:660:4406:2a0:40a::4",
+      "kavlan-13": "2001:660:4406:4a0:40a::4",
+      "kavlan-14": "2001:660:4406:5a0:40a::4",
+      "kavlan-16": "2001:660:4406:7a0:40a::4",
+      "kavlan-17": "2001:660:4406:9a0:40a::4",
+      "kavlan-18": "2001:660:4406:8a0:40a::4",
+      "kavlan-2": "2001:660:4406:481:a::4",
+      "kavlan-20": "2001:660:4406:3a0:40a::4",
+      "kavlan-21": "2001:660:4406:6a0:40a::4",
+      "kavlan-3": "2001:660:4406:482:a::4",
+      "kavlan-4": "2001:660:4406:490:a::4",
+      "kavlan-5": "2001:660:4406:491:a::4",
+      "kavlan-6": "2001:660:4406:492:a::4",
+      "kavlan-7": "2001:660:4406:493:a::4",
+      "kavlan-8": "2001:660:4406:494:a::4",
+      "kavlan-9": "2001:660:4406:495:a::4"
+    }
+  },
   "main_memory": {
     "ram_size": 515396075520
   },
@@ -45,7 +89,7 @@
       "interface": "Ethernet",
       "ip": "172.16.57.4",
       "ip6": "2001:660:4406:400:a::4",
-      "kavlan": false,
+      "kavlan": true,
       "mac": "a0:88:c2:99:19:02",
       "management": false,
       "model": "MT2910 Family [ConnectX-7]",
diff --git a/input/grid5000/sites/lyon/clusters/hydra/hydra.yaml b/input/grid5000/sites/lyon/clusters/hydra/hydra.yaml
index 21bb04b150722ecbcab0de623ca7aff0c4690dd9..ecbbc633859a5cfeefffcd9d4ae1e60e278cac1e 100644
--- a/input/grid5000/sites/lyon/clusters/hydra/hydra.yaml
+++ b/input/grid5000/sites/lyon/clusters/hydra/hydra.yaml
@@ -1,7 +1,7 @@
 ---
 model: NVIDIA Grace Hopper
 created_at: 2024-02-15
-kavlan: false
+kavlan: true
 boot_type: uefi
 exotic: true
 queues:
diff --git a/input/grid5000/vlans.yaml b/input/grid5000/vlans.yaml
index e477f33b80c535911860a1fef764e10044235c2b..9f6854517fb7a4bdaf3306e4494714c91e232267 100644
--- a/input/grid5000/vlans.yaml
+++ b/input/grid5000/vlans.yaml
@@ -90,6 +90,7 @@ vlans:
       local lyon pyxis eth0 0 0 6 0
       local lyon neowise eth0 0 0 7 0
       local lyon sirius eth0 0 0 8 0
+      local lyon hydra eth0 0 0 9 0
       local nancy gros eth0 0 0 0 0
       local nancy gros eth1 0 0 1 0
       local nancy gres eth0 0 0 2 0
@@ -149,6 +150,7 @@ vlans:
       global nancy gratouille eth0 0 0 19 14
       global lyon neowise eth0 0 0 20 0
       global lyon sirius eth0 0 0 21 0
+      global lyon hydra eth0 0 0 22 0
       global nancy grvingt eth0 0 0 24 0
       global nancy gres eth0 0 0 25 0
       global nancy grdix eth0 0 0 25 10
@@ -208,6 +210,7 @@ vlans:
       routed lyon pyxis eth0 0 12 6 0
       routed lyon neowise eth0 0 12 7 0
       routed lyon sirius eth0 0 12 8 0
+      routed lyon hydra eth0 0 12 9 0
       routed nancy gros eth0 0 16 0 0
       routed nancy gros eth1 0 16 1 0
       routed nancy grvingt eth0 0 16 3 0