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track of on which interfaces joins have occurred. This is complicated
by the possible lack of a clear behavior spec on whether interfaces
keep their joined group lists across a down/up/down transition. (On
NetBSD, they do.)
2004-01-03 Greg Troxel <gdt@ahi.ir.bbn.com>
* ripng_interface.c (ripng_multicast_join): If IPV6_JOIN_GROUP
returns EADDRINUSE, consider the join successful. This happens
when an interface goes down and comes back because
ripng_multicast_leave does not invoke the LEAVE_GROUP operation if
the interface is down. Solves problem of ripng stopping working
on an interface which goes down and then comes back up (on NetBSD).
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