[Bug 286322] IPv6 doesn't work across different FIBs (epair)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286322

--- Comment #2 from Lexi Winter <ivy@FreeBSD.org> ---
i experimented with this a bit and couldn't work out what was going on, but it
did seem to be broken, then i ran into an apparently impossible kernel panic:
https://people.freebsd.org/~ivy/hlim.txt

so i am inclined to believe something is wrong here, but i'm not sure what.

are you familiar with the sysctl net.add_addr_allfibs, and if so, how was it
set when you were testing this?  i believe to get this to work (in particular,
to add the correct routes) you need to set it to 0.

net.inet6.ip6.rfc6204w3 may also be relevant as it seems something about this
causes the kernel to send NDs from the GUA instead of the LLA.

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