diff --git a/data/grid5000/sites/lyon/clusters/sirius/nodes/sirius-1.json b/data/grid5000/sites/lyon/clusters/sirius/nodes/sirius-1.json
index 859bc3857adcd3da242a36cae78949605d32cc3d..66f5e98f1d295c06706c96dcfa28a5f6385c4ad9 100644
--- a/data/grid5000/sites/lyon/clusters/sirius/nodes/sirius-1.json
+++ b/data/grid5000/sites/lyon/clusters/sirius/nodes/sirius-1.json
@@ -198,6 +198,7 @@
       "mountable": true,
       "mounted": true,
       "name": "ib0",
+      "netmask": "255.255.240.0",
       "network_address": "sirius-1-ib0.lyon.grid5000.fr",
       "rate": 10000000000,
       "vendor": "Mellanox Technologies"
diff --git a/input/grid5000/sites/lyon/clusters/sirius/sirius_ib.yaml b/input/grid5000/sites/lyon/clusters/sirius/sirius_ib.yaml
index 13dac9592657d925d6b1c49f560c4fc5bd3b631f..4700feba95f9eb985f938c8e66722f36087b6a28 100644
--- a/input/grid5000/sites/lyon/clusters/sirius/sirius_ib.yaml
+++ b/input/grid5000/sites/lyon/clusters/sirius/sirius_ib.yaml
@@ -6,6 +6,7 @@ nodes:
         enabled: true
         mountable: true
         mounted: true
+        netmask: 255.255.240.0
       ib1:
         enabled: true
         mountable: true