--- a/src/internet-stack/ipv4-interface.cc Mon Jun 28 14:47:06 2010 -0400
+++ b/src/internet-stack/ipv4-interface.cc Tue Jun 29 20:24:20 2010 -0400
@@ -34,6 +34,8 @@
namespace ns3 {
+NS_OBJECT_ENSURE_REGISTERED (Ipv4Interface);
+
TypeId
Ipv4Interface::GetTypeId (void)
{