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Date:      Mon, 29 Jan 2018 16:57:51 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-ipfw@FreeBSD.org
Subject:   [Bug 225536] ipfw tcp-setmss doesn't seems to work
Message-ID:  <bug-225536-7515-dSdqBZZGnZ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-225536-7515@https.bugs.freebsd.org/bugzilla/>
References:  <bug-225536-7515@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D225536

Andrey V. Elsukov <ae@FreeBSD.org> changed:

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                 CC|                            |ae@FreeBSD.org

--- Comment #3 from Andrey V. Elsukov <ae@FreeBSD.org> ---
(In reply to Emmanuel Vadot from comment #2)
> I've just tested without NAT (just bypassing by adding the destination IP=
 on
> a discarded table) and the situation is the same.
> So maybe fib are the problems ?

Can you clarify a bit, is tcp-setmss works for locally originated traffic, =
and
doesn't work for forwarded traffic not depending from presence of NAT?

Also, since you use NAT, you need to disable TSO on the used NICs.

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