[Bug 263288] IPv6 system not responding to Neighbor Solicitation

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 21 Apr 2022 02:15:23 UTC

--- Comment #9 from Zhenlei Huang <zlei.huang@gmail.com> ---
(In reply to wcarson.bugzilla from comment #8)
> It seems it thinks there are lots of bad Neighbor Solicitation messages? 

neighbor solicitation: 359208
357910 bad neighbor solicitation messages

It is about 99.64% bad NS messages. Looks weird.

> Is there a way to understand why it thinks they're bad?

Yes, there is a sysctl knob 'net.inet6.icmp6.nd6_debug' which is default off.
You can turn it on.
# sysctl net.inet6.icmp6.nd6_debug=1

And then monitor the log from kernel:
# tail -F /var/log/messages

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