https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233535
--- Comment #9 from Andrey V. Elsukov <a...@freebsd.org> ---
It seems the problem is even worse. The system leaves multicast groups after
some time without any reconfiguration and stops to reply to ND6 NS.
1. ifmcstat before test:
em0:
inet 10.9.8.6
igmpv2
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::222:4dff:fe6a:5eb9%em0 scopeid 0x1
mldv1 flags=2<USEALLOW>
group ff01::1%em0 scopeid 0x1 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1%em0 scopeid 0x1 mode exclude
mcast-macaddr 33:33:00:00:00:01
2. ifconfig em0 inet6 fc00::2
3. ifmcstat
em0:
inet6 fe80::222:4dff:fe6a:5eb9%em0 scopeid 0x1
mldv1 flags=2<USEALLOW>
group ff02::2:d4f1:c447%em0 scopeid 0x1 mode exclude
mcast-macaddr 33:33:d4:f1:c4:47
group ff02::2:ffd4:f1c4%em0 scopeid 0x1 mode exclude
mcast-macaddr 33:33:ff:d4:f1:c4
group ff02::1:ff00:2%em0 scopeid 0x1 mode exclude
mcast-macaddr 33:33:ff:00:00:02
inet 10.9.8.6
igmpv2
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::222:4dff:fe6a:5eb9%em0 scopeid 0x1
mldv1 flags=2<USEALLOW>
group ff01::1%em0 scopeid 0x1 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1%em0 scopeid 0x1 mode exclude
mcast-macaddr 33:33:00:00:00:01
4. Wait about 1 minute
5. ifmcstat
em0:
inet 10.9.8.6
igmpv2
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
inet6 fe80::222:4dff:fe6a:5eb9%em0 scopeid 0x1
mldv1 flags=2<USEALLOW>
group ff01::1%em0 scopeid 0x1 mode exclude
mcast-macaddr 33:33:00:00:00:01
group ff02::1%em0 scopeid 0x1 mode exclude
mcast-macaddr 33:33:00:00:00:01
6. On the second host: ndp -c && ping6 fc00::2 => no reply
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