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[ns] multicast packet forwarding



Dear NS users,

I am doing a project about multicasting using the following topology.

N0-----N1-----N2-----N6
       |	  |	   
       |      |      
	N7	  N8     

At beginning, there is one multicast group ox8000 (N0, N7, N8)and N0 is 
sending data to N7 and N8. After a while, N2 creates another 
multicast group 0x8001, which has N2 and N6. N2 sends data to this new
group at 0x8001. Only N6 is supposed to receive the data from N2.
However, when I ran the simulation, it seemed to me that N7, N8 also
got the data from N2. Could anybody help me to figure this out?

Thanks for your help.


Jian