diff --git a/osm_nbi/instance_topics.py b/osm_nbi/instance_topics.py
index da0ba9a..8e701a8 100644
--- a/osm_nbi/instance_topics.py
+++ b/osm_nbi/instance_topics.py
@@ -710,9 +710,9 @@
             for index in range(0, count):
                 vdur = deepcopy(vdur)
                 for iface in vdur["interfaces"]:
-                    if iface.get("ip-address"):
+                    if iface.get("ip-address") and index != 0:
                         iface["ip-address"] = increment_ip_mac(iface["ip-address"])
-                    if iface.get("mac-address"):
+                    if iface.get("mac-address") and index != 0:
                         iface["mac-address"] = increment_ip_mac(iface["mac-address"])
 
                 vdur["_id"] = str(uuid4())