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[ns] hi...



hi... all...
I'm trying to design a smart router.
Here is the topology:
node 2 is a router between node 1 and node3.
All links are duplex drop-tail.
All I wanna do is whenever node1 sends too fast,
node2 will notice node1 by sending a special packet.
What files should I modify?
drop-tail.cc? node.cc?
create a agent at node2?
or any other way is better?
Thanks a lot... :)    
                     Jay...

    duplex-link, drop-tail
 node1 --------> node2 ------> node3
       <-------        <-----