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From: "Prokofiev S.P." <proks@skylinetele.com>
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To: Pyun YongHyeon <pyunyh@gmail.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: kern/141843: [em] [vlan] Intel txcsum and assigned vlan invoke
 wrong dst MAC in TCP packets
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Thanks Pyun YongHyeon!
I apply patch em.csum_tso.20091230.patch and rebuild/reinstall kernel 
and have received successful result for tcp and udp connections (test by 
iperf).
But the  hangs down/up nic bug do not disappear (kern/141285 without 
connection problems after your patch). Please pay attention to this problem.