[Bug 235607] Incorrect checksums with NAT on vtnet with offloading

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235607

Eugene Grosbein <eugen at freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |eugen at freebsd.org

--- Comment #2 from Eugene Grosbein <eugen at freebsd.org> ---
(In reply to Jorge Schrauwen from comment #1)

For ipfw nat and/or natd both based on libalias, this is known and documented
in the ipfw(8) manual page:

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

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