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Date:      Tue, 30 Jan 2018 20:48:40 +0000
Subject:   [Bug 225536] ipfw tcp-setmss doesn't seems to work
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--- Comment #6 from ---
(In reply to Emmanuel Vadot from comment #5)


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

See my mailing list thread about this from last year at
(disabling TSO). Slightly related is another thread
(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)."


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