Another relevant piece of information is what the socket is
bound to; "netstat -au" will tell you if you're bound to an address
that will match the incoming multicast packets.
If you suspect that the VLAN device is the problem, then it'd be
a good idea to try it on ordinary ethernet.
Re: imr_ifindex; using a "0" ifindex and INADDR_ANY interface is valid,
but it usually doesn't make sense. What it means is "I don't care what
interface I join the group on". But you'll only receive multicasts
delivered to the group on the interface the kernel picks for you, which
often won't be the one you really want.
+-DLS
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