[ns] trace a data packet

[boo sunn]

hi:

I am modifying AODV, and now I need to know what the
route a data packet takes to get to the destination.
Also I need to add some code in the destination node
to deal with the data packet. 

Which file I need to modify? if I am using UDP
traffic, do I need to modify udp.cc?

Thanks,

bo sun

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