[Bug 225536] ipfw tcp-setmss doesn't seems to work

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225536

graham at menhennitt.com.au changed:

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                 CC|                            |graham at menhennitt.com.au

--- Comment #6 from graham at 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 significant
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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