diff -r f3c86a2d4082 src/applications/udp-echo/udp-echo-server.cc
--- a/src/applications/udp-echo/udp-echo-server.cc	Tue Jun 24 09:21:02 2008 -0700
+++ b/src/applications/udp-echo/udp-echo-server.cc	Tue Jun 24 12:32:36 2008 -0700
@@ -104,6 +104,8 @@ UdpEchoServer::HandleRead (Ptr<Socket> s
           NS_LOG_INFO ("Received " << packet->GetSize() << " bytes from " << 
             address.GetIpv4());
 
+          packet->RemoveAllTags ();
+
           NS_LOG_LOGIC ("Echoing packet");
           socket->SendTo (packet, 0, from);
         }