Date: Fri, 8 Apr 2016 10:03:25 +0100 From: Dr Josef Karthauser <joe@truespeed.com> To: Ian Smith <smithi@nimnet.asn.au> 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: <F5A94B5B-9261-48F3-AD5E-C123EA48324D@truespeed.com> In-Reply-To: <20160408154100.E39547@sola.nimnet.asn.au> References: <A03E136A-7599-4992-9F9E-13E7350F972B@truespeed.com> <20160408154100.E39547@sola.nimnet.asn.au>
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> On 8 Apr 2016, at 06:51, Ian Smith <smithi@nimnet.asn.au> wrote: > > 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 .. > Thanks Ian, It was exactly that issue! I wish I had remembered that I’d seen that in the man page; would have saved hours of debugging :) Joe — Dr Josef Karthauser Chief Technical Officer (01225) 300371 / (07703) 596893 www.truespeed.com / theTRUESPEED @theTRUESPEED
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