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Date:      Fri, 8 Apr 2016 15:51:24 +1000 (EST)
From:      Ian Smith <smithi@nimnet.asn.au>
To:        Dr Josef Karthauser <joe@truespeed.com>
Cc:        FreeBSD Stable <stable@freebsd.org>, freebsd-net@freebsd.org
Subject:   Re: IPFW with NAT : Problems with duplicate packets on FreeBSD 10.3-RC3
Message-ID:  <20160408154100.E39547@sola.nimnet.asn.au>
In-Reply-To: <A03E136A-7599-4992-9F9E-13E7350F972B@truespeed.com>
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On Thu, 7 Apr 2016 17:08:38 +0100, Dr Josef Karthauser wrote:

[ AppleMail msgs fail to quote properly in pine, so a partial quote: ]

 > Looks like the first packet is being retransmitted, which means that 
 > the nat is probably misconfigured and the TCP connection is broken in
 > some strange way.

 > Does anyone have a clue as to where to look? The ipfw rules are
 > simple enough - what have I missed?

Do you have TSO enabled on that NIC?  If so, see ipfw(8) BUGS, third 
last para.  If not, no idea ..

cheers, Ian
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