[openib-general] ipoib send-only join to IGMP multicast group

[Jack Morgenstein]

I noticed that at startup, IPoIB attempts a send-only join to the MGID
ff12:401b:ffff:0:0:0:0:16 (equivalent to IP 224.0.0.22 -- the IGMP multicast
group -- see http://www.iana.org/assignments/multicast-addresses).

1. Why is this a send-only join? Is this just so that the local host to
"announce" itself to a router (for neighbor calculations)?
2. Who is responsible for creating this multicast group in IPoIB? (A
send-only join will not cause a group to be created if it does not yet
exist)

Jack Morgenstein

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