--- a/src/internet/model/udp-socket-impl.cc	Mon Feb 13 18:54:22 2012 +0000
+++ a/src/internet/model/udp-socket-impl.cc	Sun Feb 19 13:35:45 2012 -0800
@@ -639,6 +639,11 @@ 
     {
       Address address = InetSocketAddress (header.GetSource (), port);
       SocketAddressTag tag;
+      // remove any previously added socket address tags  
+      while (packet->RemovePacketTag (tag)) 
+        {
+          NS_LOG_DEBUG ("Removing SocketAddressTag with address " << tag.GetAddress()); 
+        }
       tag.SetAddress (address);
       packet->AddPacketTag (tag);
       m_deliveryQueue.push (packet);