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Subject: [Bug 203524] TCP checksum failed on igb network adapter
Date: Mon, 05 Oct 2015 01:27:34 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203524

--- Comment #1 from eugen@grosbein.net ---
Please read ipfw(8) manual page, section BUGG; this is known and documented
problem of ipfw nat:

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

This PR should be closed.

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