--- ns-3-dev/src/internet/model/udp-socket-impl.cc	2012-01-26 15:52:06.000000000 -0200
+++ workspace/src/ns-3-dev/src/internet/model/udp-socket-impl.cc	2012-01-26 16:15:16.000000000 -0200
@@ -31,6 +31,7 @@
 #include "udp-socket-impl.h"
 #include "udp-l4-protocol.h"
 #include "ipv4-end-point.h"
+#include "udp-header.h"
 #include <limits>
 
 NS_LOG_COMPONENT_DEFINE ("UdpSocketImpl");
@@ -440,6 +441,13 @@
       Ptr<Ipv4Route> route;
       Ptr<NetDevice> oif = m_boundnetdevice; //specify non-zero if bound to a specific device
       // TBD-- we could cache the route and just check its validity
+
+      // Patch - BUG 1111 - UDP header does not attached before RouteOutput
+      UdpHeader headerUdp;
+      headerUdp.SetSourcePort(m_endPoint->GetLocalPort ());
+      headerUdp.SetDestinationPort(port);
+      p->AddHeader(headerUdp);
+
       route = ipv4->GetRoutingProtocol ()->RouteOutput (p, header, oif, errno_); 
       if (route != 0)
         {