diff --git a/confluent_server/confluent/discovery/protocols/slp.py b/confluent_server/confluent/discovery/protocols/slp.py
index 8667feef..8f95d9c3 100644
--- a/confluent_server/confluent/discovery/protocols/slp.py
+++ b/confluent_server/confluent/discovery/protocols/slp.py
@@ -542,6 +542,8 @@ def active_scan(handler, protocol=None):
     for scanned in scan():
         for addr in scanned['addresses']:
             ip = addr[0].partition('%')[0]  # discard scope if present
+            if ip not in neighutil.neightable:
+                neighutil.update_neigh()
             if ip not in neighutil.neightable:
                 continue
             if addr in known_peers:
diff --git a/confluent_server/confluent/discovery/protocols/ssdp.py b/confluent_server/confluent/discovery/protocols/ssdp.py
index b438af1a..de0fb8ef 100644
--- a/confluent_server/confluent/discovery/protocols/ssdp.py
+++ b/confluent_server/confluent/discovery/protocols/ssdp.py
@@ -62,6 +62,8 @@ def active_scan(handler, protocol=None):
     for scanned in scan(['urn:dmtf-org:service:redfish-rest:1']):
         for addr in scanned['addresses']:
             ip = addr[0].partition('%')[0]  # discard scope if present
+            if ip not in neighutil.neightable:
+                neighutil.update_neigh()
             if ip not in neighutil.neightable:
                 continue
             if addr in known_peers:
@@ -311,6 +313,8 @@ def _parse_ssdp(peer, rsp, peerdata):
     ip = peer[0].partition('%')[0]
     nid = ip
     mac = None
+    if ip not in neighutil.neightable:
+        neighutil.update_neigh()
     if ip in neighutil.neightable:
         nid = neighutil.neightable[ip]
         mac = nid