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Date:      Mon, 04 Jan 2021 14:22:09 +0000
From:      "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
To:        "Lutz Donnerhacke" <lutz@donnerhacke.de>
Cc:        freebsd-questions@freebsd.org, freebsd-net@freebsd.org
Subject:   Re: FreeBSD does not reply to IPv6 Neighbor Solicitations
Message-ID:  <C3AB2C0C-083C-425A-B4E9-75109ECDE089@lists.zabbadoz.net>
In-Reply-To: <006901d6e2a4$4d9d80d0$e8d88270$@donnerhacke.de>
References:  <006901d6e2a4$4d9d80d0$e8d88270$@donnerhacke.de>

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On 4 Jan 2021, at 14:17, Lutz Donnerhacke wrote:

>> Victor Sudakov wrote:
>>> Dear Colleagues,
>>>
>>> Why could it be that a FreeBSD 12.2 host does not reply to ICMPv6
>>> Neighbor Solicitations from the router?
>>
>> Any ideas please?
>
> Thank you for pointing this out.
> I do have an similar effect, after upgrading, and you point me to a 
> good
> direction.
> I'll investigate and report back.


I’d start by checking netstat -s -p icmp6 and netstat -s -p ip6  for 
any suspicious counter updates.

Another thing to do might be to turn on nd6 log/debugging by sysctl  
(sysctl net.inet6.icmp6.nd6_debug=0xff should do it) and keep an eye on 
the kernel messages.


/bz




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