[ns] Please help me print the path that packet go through.

[tan cam]

Hello everyone,
I have a topology:
                   Node2_______Node3
                  /                 \
                 /                   \
node0________Node1                   Node5__________Node6
                \                   /
                 \_____Node4_______/

(Node0 link to node1, 
node1 link to node2, 
node1 link to node4, 
node2 link to node3, 
node3 link to node5, 
node4 link to node5, 
node5 link to node6 )


I sent some packet from Node0 to Node6,
When I received any packet on node6, I want to print the path that this packet 
go through.
(example: Packet1:Node0-Node1-Node4-Node5-Node6)
Thank you so much.
===========================
Nguyen Tan Cam

HCMUS
===========================