[Bug 233683] IPv6 ND neighbor solicitation messages fail to arrive

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233683

--- Comment #16 from Kristof Provost <kp@freebsd.org> ---
(In reply to Andrey V. Elsukov from comment #15)
It's not hardware related. I can trivially reproduce the issue on if_epair.
There's long debugging saga in https://redmine.pfsense.org/issues/13423, but
here's a short version:

> [kp@nut ~]$ sudo ifconfig epair create epair0a
> [kp@nut ~]$ sudo ifconfig epair0a inet6 2001:db8::1/64 up
> [kp@nut ~]$ ifmcstat -i epair0a
> epair0a:
> 	inet6 fe80::9e:e8ff:fe02:780a%epair0a scopeid 0xc
> 	mldv2 flags=2<USEALLOW> rv 2 qi 125 qri 10 uri 3
> 		group ff02::1:ff00:1%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:ff:00:00:01
> 		group ff01::1%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:00:00:00:01
> 		group ff02::2:6c69:386f%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:6c:69:38:6f
> 		group ff02::2:ff6c:6938%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:ff:6c:69:38
> 		group ff02::1%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:00:00:00:01
> 		group ff02::1:ff02:780a%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:ff:02:78:0a
> [kp@nut ~]$ sudo ifconfig epair0a inet6 2001:db8::1/64
> [kp@nut ~]$ ifmcstat -i epair0a
> epair0a:
> 	inet6 fe80::9e:e8ff:fe02:780a%epair0a scopeid 0xc
> 	mldv2 flags=2<USEALLOW> rv 2 qi 125 qri 10 uri 3
> 		group ff01::1%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:00:00:00:01
> 		group ff02::2:6c69:386f%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:6c:69:38:6f
> 		group ff02::2:ff6c:6938%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:ff:6c:69:38
> 		group ff02::1%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:00:00:00:01
> 		group ff02::1:ff02:780a%epair0a scopeid 0xc mode exclude
> 			mcast-macaddr 33:33:ff:02:78:0a

Note the lost subscription to the ff02::1:ff00:1%epair0a group.

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