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Date:      Tue, 14 Jun 2022 07:44:12 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 261129] IPv6 default route vanishes with rtadvd/rtsold
Message-ID:  <bug-261129-227-6FqD4lznOi@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-261129-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-261129-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D261129

--- Comment #16 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
After taking some measures and test, so far I came to following conclusions:

1. The default route gets _silently_ corrupted irregardless of deployed
route.algo, with no traces observable neither with route(8) monitor nor with
increased net.route.algo.debug_level due to unknown reason (overflow ?).

2. Setting net.inet6.ip6.no_radr=3D1 net.inet6.ip6.accept_rtadv=3D0 and
respectively disabling these options on the interfaces doesn't prevent the
default route from being corrupted. Changing the value of net.add_addr_allf=
ibs
doesn't help either.=20

3. Restarting "routing" service fixes the issue for some time.

4.FreeBSD routing stack at current state doesn't allow to use in production=
 two
different IPv6 GUA subsets on the same interface neither on 13-STABLE nor
CURRENT (tested on amd64 and arm64 archs).

5. PF(4) supports rtable, route-to and reply-to for IPv6 traffic allowing
deployment of more advanced network scenarios.

6. IPv6 on FreeBSD still needs more testing, especially in muiltihomed
scenarios where multiple FIBs are involved.

--=20
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