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Date:      Tue, 20 Apr 2021 09:39:21 -0700
From:      Freddie Cash <>
To:        Mark Delany <>
Cc:        FreeBSD Hackers <>
Subject:   Re: Various problems with 13.0 amd64 on
Message-ID:  <>
In-Reply-To: <>
References:  <> <> <>

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On Tue, Apr 20, 2021 at 12:34 AM Mark Delany <> wrote:

> On 19Apr21, Mason Loring Bliss allegedly wrote:
> > I haven't seen a hang yet, but the test system hasn't been up much more
> > than ten minutes, so I'll report back later.
> I think I've isolated it to natd traffic.
> The system stays up reliably with natd disabled but hangs within a couple
> of minutes of an
> inbound ipv4 traffic.
> If I just run with the ipfw rule and the divert kernel module, then no
> problem the system
> runs albeit without any real ipv4 traffic working for obvious reasons. But
> I can happily
> do anything I like in ipv6 and it runs fine.
> But as soon as natd is run with inbound traffic such as an ssh session,
> then the system
> mostly hangs and according to the vultr console, it's spinning at 100% CPU.

If you re-write your rules to use the in-kernel libalias support instead of
divert sockets sending traffic to natd, does it stay up while passing IPv4

That would help narrow it down even further to natd issues.

Freddie Cash

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