--- a/src/node/simple-net-device.h	Fri Jul 04 17:58:31 2008 +0100
+++ b/src/node/simple-net-device.h	Fri Jul 04 18:03:26 2008 +0100
@@ -63,6 +63,7 @@
   virtual Address MakeMulticastAddress (Ipv4Address multicastGroup) const;
   virtual bool IsPointToPoint (void) const;
   virtual bool Send(Ptr<Packet> packet, const Address& dest, uint16_t protocolNumber);
+  virtual bool SendFrom(Ptr<Packet> packet, const Address& source, const Address& dest, uint16_t protocolNumber);
   virtual Ptr<Node> GetNode (void) const;
   virtual void SetNode (Ptr<Node> node);
   virtual bool NeedsArp (void) const;