Date: Tue, 7 Jul 2020 12:01:05 +0200 From: Fabrice Colliot <f.colliot@gmail.com> To: freebsd-net@freebsd.org Subject: Multicast: membership to (*, G) group after leaving a (S, G) group Message-ID: <CAC-yrDdYJbfcr=EqJ%2BQOZZCPVt6S7o=cQWNqfM6LQz=ffZi1-A@mail.gmail.com>
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Hi,
I'm using smcroute to join and leave multicast groups and I don't
understand the behavior of FreeBSD when the group is left.
Here is what I do:
smcroute join em1 10.3.4.5 224.0.55.55
ifmcstat -i em1
em1:
inet 10.10.0.1
igmpv3 rv 2 qi 125 qri 10 uri 3
group 224.0.55.55 mode include
mcast-macaddr 01:00:5e:00:37:37
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
smcroute leave em1 10.3.4.5 224.0.55.55
ifmcstat -i em1
em1:
inet 10.10.0.1
igmpv3 rv 2 qi 125 qri 10 uri 3
group 224.0.55.55 mode undefined
mcast-macaddr 01:00:5e:00:37:37
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
At this point, I expected to have no membership left on em1 for 224.0.55.55
but ifmcstat shows that the interface is still a member of the group but in
undefined mode.
I was wondering if anybody could tell me why the group membership seems to
be transitioned to a (*, G) membership when all the (S, G) memberships are
removed.
Thanks!
Fabrice
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