[Bug 253469] IPv6 default route vanishes

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

--- Comment #11 from courtney.hicks1 at icloud.com ---
For the nd6_options message, I only see it twice. Looking at it, it looks to
come around the completion of DAD for my re0 link local and autoconf IPv6
address. Sorry if some of my terminology is poor, my IPv6 knowledge has gotten
rusty.

inet.inet6.ip6.forwarding = 0
inet.inet6.ip6.rfc.6204w3 = 0

The output of ndp -i rs0:

linkmtu=1500, maxmtu=1500, curhlim=64, basereachable=30s0ms, reachable=18s,
retrans=1s0ms
Flags: nud accept_rtadv auto_linklocal

For the tcpdump, I see nothing showing up. I have tried with my firewall both
on and off. With promisc mode enabled I am getting router solicitation packets.
Actually, what's also interesting is when I enable promiscuous mode the RAs
work and I don't lose my routes. Then if I turn promiscuous mode off I lose my
route again. I see there are nd6 updates available in releng/13.0 branch. So
I'm going to create a new boot environment and see if I have these issues after
the update. I'll be keeping my existing boot environment with the issues. I'm
getting src updates via gitup. For the future:

# Have: c48cbd0254dedd363ab569692ddf3395b6214412
# Want: 1e76911d62ed4b66bc21cfc22101ef6b20cd6630

I'll update this bug report after things compile and such.

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