How to enable tcp bbr in FreeBSD???

Mark Johnston markj at
Fri Apr 24 14:23:45 UTC 2020

On Fri, Apr 24, 2020 at 03:15:08PM +0100, Tom Jones wrote:
> rrs at
> Bcc: 
> Subject: Re: How to enable tcp bbr in FreeBSD???
> Reply-To: 
> In-Reply-To: <6042155a-297b-d85e-1d64-24d93da329a2 at>
> ... snip ...
> > 
> > Maybe it is not ready for prime time, i do not know why it is not in the
> > default build.
> > Maybe ask the committer.
> > 
> I have added rrs@ in cc and the freebsd-transport list. 
> Does anyone know if there are plans to enable alternate TCP stacks in
> generic? 
> Is there a stability point we need to hit first?

There are a couple of open bugs found by syzkaller (complete with
reproducers) that appeared when I enabled the alternate TCP stacks:

I'd expect these to be fixed before providing the alternate stacks in

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