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From: "Lutz Donnerhacke" <lutz@donnerhacke.de>
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Subject: AW: FreeBSD does not reply to IPv6 Neighbor Solicitations
Date: Mon, 4 Jan 2021 18:25:05 +0100
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> I=E2=80=99d start by checking netstat -s -p icmp6 and netstat -s -p =
ip6  for
> any suspicious counter updates.

Great idea. It points me tot he most stupid error I could make.

Instead of=20
  ifconfig_lagg140_aliases=3D"inet6 2a01:75c0:1000:140::/64 anycast"
I wrote
  ifconfig_vlan140_aliases=3D"inet6 2a01:75c0:1000:140::/64 anycast"
so the IPv6 address was not set after reboot.

This fails to get noticed, due the long lifetime of the announced =
prefix.
(the error has been visible since a few days only, I had no time to =
investigate)

So I can confess, plain 12.2-STABLE is no broken.