On Tue, 2005-09-13 at 11:54, Jack Morgenstein wrote: > 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)?
The router needs to create the group for the hosts to join. > 2. Who is responsible for creating this multicast group in IPoIB? See above. > (A send-only join will not cause a group to be created if it does not > yet exist) Correct. BTW, I think there may be a difficiency in Linux multicast semantics v. IB multicast semantics which has been commented on previously (a long time ago). -- Hal _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
