diff --git a/data/grid5000/accesses/refrepo.json b/data/grid5000/accesses/refrepo.json
index 762975c6378e0407ce5a456587ca758f31edad1c..88120f7ad4a0bae60ad6acba5df3abcb5f0c4254 100644
--- a/data/grid5000/accesses/refrepo.json
+++ b/data/grid5000/accesses/refrepo.json
@@ -4369,7 +4369,7 @@
                   "interface": "Omni-Path",
                   "ip": "172.18.20.29",
                   "kavlan": false,
-                  "mac": "00:11:75:01:01:70:82:69",
+                  "mac": "00:11:75:09:01:c4:70:6a",
                   "management": false,
                   "model": "Omni-Path HFI Silicon 100 Series [discrete]",
                   "mountable": true,
diff --git a/data/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-29.json b/data/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-29.json
index 8064d2979bff677020d7dedb624cef3b7b9394a7..5ac84bb7d1d430d68e86dc11dd445e6147fc09b8 100644
--- a/data/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-29.json
+++ b/data/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-29.json
@@ -185,7 +185,7 @@
       "interface": "Omni-Path",
       "ip": "172.18.20.29",
       "kavlan": false,
-      "mac": "00:11:75:01:01:70:82:69",
+      "mac": "00:11:75:09:01:c4:70:6a",
       "management": false,
       "model": "Omni-Path HFI Silicon 100 Series [discrete]",
       "mountable": true,
diff --git a/input/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-29.yaml b/input/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-29.yaml
index 9cba988f2592d84de29a44f5f6e3894a6a725378..e1c003e5f796d500c7d204d361b4a0a0ee5c4d64 100644
--- a/input/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-29.yaml
+++ b/input/grid5000/sites/grenoble/clusters/dahu/nodes/dahu-29.yaml
@@ -90,7 +90,7 @@ dahu-29:
       guid: '0x0011750101708269'
       interface: Omni-Path
       ip: 172.18.20.29
-      mac: 00:11:75:01:01:70:82:69
+      mac: 00:11:75:09:01:c4:70:6a
       management: false
       model: Omni-Path HFI Silicon 100 Series [discrete]
       name: ib0