I've run your test program and it receives fine for me.
I note that the source address is not on the same subnet as
(any of) the receiver's addresses. Are the packets being
routed? The default multicasting TTL is 1, though I don't
know if it'll be checked or dropped on the receiver, seeing
as we aren't forwarding it.
Also, you might want to run "netstat -s" to see if any of the
drop counters are being incremented (e.g., checksum error).
Finally, I'm assuming you don't have any firewall rules that
are matching, right?
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