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

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

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

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                 CC|                            |ae at FreeBSD.org

--- Comment #3 from Andrey V. Elsukov <ae at 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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