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Date:      Tue, 30 Jan 2018 20:48:40 +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-OktqRODtfF@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

graham@menhennitt.com.au changed:

           What    |Removed                     |Added
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                 CC|                            |graham@menhennitt.com.au

--- Comment #6 from graham@menhennitt.com.au ---
(In reply to Emmanuel Vadot from comment #5)

Emmanuel,


I can't tell you why it matters, but I can say that it does make a signific=
ant
difference.

See my mailing list thread about this from last year at
https://lists.freebsd.org/pipermail/freebsd-ipfw/2017-August/006578.html
(disabling TSO). Slightly related is another thread
https://lists.freebsd.org/pipermail/freebsd-ipfw/2017-September/006585.html
(disable TXCSUM).

Also, see the ipfw(8) man page in the BUGS section:

"Due to the architecture of libalias(3), ipfw nat is not compatible with the
TCP segmentation offloading (TSO).  Thus, to reliably nat network traffic,
please disable TSO on your NICs using ifconfig(8)."

Graham

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