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Date:      Mon, 01 Feb 2021 20:28:02 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 253096] TCP MD5 not supported with  net.inet.tcp.functions_default=rack
Message-ID:  <bug-253096-7501-9zkdvDCmgI@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-253096-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-253096-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D253096

Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|TCP MD5 regression on       |TCP MD5 not supported with
                   |STABLE/13                   |net.inet.tcp.functions_defa
                   |                            |ult=3Drack

--- Comment #3 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
The setting net.inet.tcp.functions_default=3Drack was the culprit. Probably=
 TCP
RACK is not supposed to support TCP MD5 and this bug has to be closed, but =
let
people from the project decide and give some feedback here.

I have done more tests with the most recent stable{12,13} and it looks like
that with net.inet.tcp.functions_default=3Dfreebsd TCP MD5 signatures are
supported fine. I have tried to revert this setting to default prior to
reporting this as a bug but it not always worked.
I am sorry for the noise on Bugzilla and freebsd-net@ mailing list, but in
initial tests disabling RACK wasn't sufficient to get TCP MD5 working (prob=
ably
due to accidentally flushing IPsec rules in the meantime), so I took some
ad-hoc steps to repair it quickly, disabling some devices, reverting sysclt=
s to
default values etc.

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