Index: Universal/Network/Ip4Dxe/Ip4Input.c
===================================================================
--- Universal/Network/Ip4Dxe/Ip4Input.c	(revision 15766)
+++ Universal/Network/Ip4Dxe/Ip4Input.c	(working copy)
@@ -937,7 +937,9 @@
   // Dispatch the DPCs queued by the NotifyFunction of the rx token's events
   // which are signaled with received data.
   //
+  Print (L"Ip4AccpetFrame: Before DispatchDpc\n");
   DispatchDpc ();
+  Print (L"Ip4AccpetFrame: After DispatchDpc\n");
 
 RESTART:
   Ip4ReceiveFrame (IpSb->DefaultInterface, NULL, Ip4AccpetFrame, IpSb);
@@ -1328,8 +1330,9 @@
     Token                = NetMapRemoveHead (&IpInstance->RxTokens, NULL);
     Token->Status        = IP4_GET_CLIP_INFO (Packet)->Status;
     Token->Packet.RxData = &Wrap->RxData;
-
+    Print (L"Ip4InstanceDeliverPacket: Before SignalEvent\n");
     gBS->SignalEvent (Token->Event);
+    Print (L"Ip4InstanceDeliverPacket: After SignalEvent\n");
   }
 
   return EFI_SUCCESS;