[Bug 253469] IPv6 default route vanishes

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253469

Bjoern A. Zeeb <bz at FreeBSD.org> changed:

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                 CC|                            |bz at FreeBSD.org

--- Comment #10 from Bjoern A. Zeeb <bz at FreeBSD.org> ---
(In reply to courtney.hicks1 from comment #0)

To me this sounds that unsolicited RAs (as send out periodically by your
router) don't make it while solicited (rtsol "asking") work.

That may imply that there are filters somewhere not working properly or
multicast is not properly received.

If you do see the unsolicited RAs from your router in
   tcpdump -ln -s0 -i re0 -vvv icmp6
then can you do the following:

(0) confirm no firewall active on your local system?
(a) wait for the default route to go away
(b) do not restart anything!
(c) start tcpdump as per above
(d) when you see an unsolicited RA coming back in, check (in a 2nd terminal) if
your default route is back or not.

(d1) if it is not; please report
(d2) if it is back then stop tcpdump, do an ifconfig re0 promisc;  keep
watching if your default route goes away again or not during the next 25
minutes and report back.

Otherwise and/or in addition sysctl net.inet6.icmp6.nd6_debug=0xff may also
help Alexander to further debug this.

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