[ns] ns3 UdpEcho application oddness

[Mike MacGregor]

Hi,

I took the tutorial-linear-dumbbell example and put a 2-node ISP  
"cloud" in the middle (code attached). When the client is instantiated  
on the same node that attaches the west LAN to the cloud the server  
(which is in the middle of the east LAN) fails to return the echo. If  
the client is instantiated on any of the other nodes in the west LAN  
the server responds as expected. It's as if the server doesn't have a  
route to the client, but I haven't groped through the routing tables  
yet (still just getting started with ns3).

No big deal because the workaround is obvious, and apologies if this  
has already been noted. I just joined this list and - culpa mea -  
haven't read the back issues yet.

Regards,
Mike MacGregor


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