diff --git a/python/pacemaker/_cts/cib.py b/python/pacemaker/_cts/cib.py
index 1dccd56c96f..c8168d703ba 100644
--- a/python/pacemaker/_cts/cib.py
+++ b/python/pacemaker/_cts/cib.py
@@ -72,7 +72,7 @@ def new_ip(self, name=None):
 
         if ":" in ip:
             r["cidr_netmask"] = "64"
-            r["nic"] = "eth0"
+            r["nic"] = self._cm.env["nic"]
         else:
             r["cidr_netmask"] = "32"
 
diff --git a/python/pacemaker/_cts/environment.py b/python/pacemaker/_cts/environment.py
index 727d04eb09f..5c32b3d34ef 100644
--- a/python/pacemaker/_cts/environment.py
+++ b/python/pacemaker/_cts/environment.py
@@ -258,6 +258,9 @@ def _parse_args(self, argv):
         grp2.add_argument("--ip", "--test-ip-base",
                           metavar="IP",
                           help="Offset for generated IP address resources")
+        grp2.add_argument("--nic",
+                          default="eth0",
+                          help="Network interface used for generated IP address resources")
 
         grp3 = parser.add_argument_group("Options for release testing")
         grp3.add_argument("-r", "--populate-resources",
@@ -349,6 +352,7 @@ def _parse_args(self, argv):
         self["notification-agent"] = args.notification_agent
         self["notification-recipient"] = args.notification_recipient
         self["unsafe-tests"] = args.unsafe_tests
+        self["nic"] = args.nic
 
         # Everything else either can't have a default set in an add_argument
         # call (likely because we don't want to always have a value set for it)