--- a/src/internet-node/arp-l3-protocol.cc	Tue Jul 31 09:09:31 2007 +0200
+++ b/src/internet-node/arp-l3-protocol.cc	Tue Jul 31 09:17:05 2007 +0200
@@ -34,6 +34,7 @@
 
 namespace ns3 {
 
+const InterfaceId ArpL3Protocol::iid = MakeInterfaceId ("ArpL3Protocol", Object::iid);
 const uint16_t ArpL3Protocol::PROT_NUMBER = 0x0806;
 
 ArpL3Protocol::ArpL3Protocol (Ptr<Node> node)