Re: Question on adding/deleting multicast routes

[David Stevens]

If you specify the interface explicitly, by using IP_MULTICAST_IF or
setting it in the join, then it will listen on the correct interface 
regardless
of the routing table. If you don't, the kernel picks an interface for you,
and I'd guess it's picking the wrong one when it's failing for you.

                                                +-DLS

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