I don't know why you'd want it to be different for multicasting. If you
want to hear your own multicasts, you should use MULTICAST_LOOP;
hearing them off the wire indicates all the same bad things -- a forger,
a duplicate address or a routing loop. Those aren't any better for
multicasting than they are for unicasting, that I can see.
Why would you want that to be delivered, other than (apparently)
to test the multicast capability of a pair of interfaces while using
only 1 machine?
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