[Bug 211872] IPv6 UDP traffic sometimes sent using wrong mac address

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211872

--- Comment #5 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Mike Andrews from comment #0)
> 12:46:22.835272 00:25:90:57:21:b3 > 00:25:90:23:be:bc, ethertype IPv6
> (0x86dd), length 232: fdfa::fafa:d53a.53 > fdfa::fafa:d53b.15484: 47157*
> 1/2/4 A 64.191.171.200 (170)
> 12:46:27.836186 00:25:90:38:6f:fa > 00:25:90:57:21:b3, ethertype IPv6
> (0x86dd), length 92: fdfa::fafa:d53b.39323 > fdfa::fafa:d53a.53: 47157+ A?
> www.fark.com. (30)
> 12:46:27.836340 00:25:90:57:21:b3 > 00:25:90:23:be:bc, ethertype IPv6
> (0x86dd), length 232: fdfa::fafa:d53a.53 > fdfa::fafa:d53b.39323: 47157*
> 1/2/4 A 64.191.171.200 (170)
> 
> 00:50:90:23:be:bc is a totally different 3rd machine.  That's.... weird. :)
> 
> Add the -T flag to the "host" command to force TCP, and it works.
> 
> Flip the queries around so that machine 1 queries machine 2, and it works.
> 
> I'm seeing similar issues with other similar machines (and similar hardware,
> all Supermicro machines with Intel em nics of varying vintage) that have
> been updated to 11.0-RC1.  All ware fine on 10.3-RELEASE.  The only
> em-specific tweak I've got is "-tso", but turning tso back on doesn't change
> behavior any.

Can you check `ndp -an` on the problematic machine at the time when you see
wrong addresses?

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