[Bug 121257] [tcp] TSO + natd -> slow outgoing tcp traffic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=121257

Eugene Grosbein <ports at grosbein.net> changed:

           What    |Removed                     |Added
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                 CC|                            |ports at grosbein.net

--- Comment #7 from Eugene Grosbein <ports at grosbein.net> ---
natd and ipfw nat both based on libalias that is not compatible with ISO. This
is documented in ipfw(8) manual page, section BUGS. Before introduction of ipfw
nat this section mentioned natd and was erronously changed to mention only ipfw
nat.

Antway, it says: "Thus, to reliably nat your network traffic, please disable
TSO on your NICs using ifconfig(8)".

This PR should be closed as this documented behavour was always such.
ipfw(8) manual page and natd(8) should be fixed to explicitly mention that
natd(8) is not compatible with TSO.

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