path stretch support
diff --git a/model/ccnx-l3-protocol.h b/model/ccnx-l3-protocol.h
index d3e1b44..f4b8f61 100644
--- a/model/ccnx-l3-protocol.h
+++ b/model/ccnx-l3-protocol.h
@@ -118,6 +118,9 @@
   virtual Ptr<CcnxFace>
   GetFaceByNetDevice (Ptr<NetDevice> netDevice) const;
   
+  virtual Ptr<NetDevice>
+  GetNetDeviceByFace (Ptr<CcnxFace> face) const;
+  
   Ptr<CcnxPit> GetPit();
   
   // void ScheduleLeakage();