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Date: Sun, 21 Oct 2012 03:54:35 +0700
From: Eugene Grosbein <egrosbein@rdtc.ru>
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To: Nikolay Nevzorov <nevzorovn@gmail.com>
Subject: Re: kern/171520: [alc] alc network driver + tso + vlan does not work.
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20.10.2012 20:06, Nikolay Nevzorov wrote:

>> Synopsis: [alc] alc network driver + tso + vlan does not work.

It seems you use libalias-based NAT, don't you?

man ipfw says 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 your net-
     work traffic, please disable TSO on your NICs using ifconfig(8).

Eugene Grosbein