sorry, i was wrong about ff02::1.

>=> But do you assume that the default router on a p2p link
>will forward mcast packets to multiple links even though 
>hosts on those links didn't join this group?
>                       incoming packet to ff02::blah
>                         |        
>               H2--------R------- H1
>If only H2 joined, doyou assume that the router will
>send it to H1 as well? Why?
>Note H1 and H2 do not share the same link.

        i was trying to think about packets originated from R.  not the
        forwarding case.

itojun
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