From owner-freebsd-stable@freebsd.org Fri Apr 8 09:03:35 2016 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 4EEAFB07DBB for ; Fri, 8 Apr 2016 09:03:35 +0000 (UTC) (envelope-from joe@truespeed.com) Received: from mailman.ysv.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 358FA11C0 for ; Fri, 8 Apr 2016 09:03:35 +0000 (UTC) (envelope-from joe@truespeed.com) Received: by mailman.ysv.freebsd.org (Postfix) id 3156EB07DB9; Fri, 8 Apr 2016 09:03:35 +0000 (UTC) Delivered-To: stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 31007B07DB7 for ; Fri, 8 Apr 2016 09:03:35 +0000 (UTC) (envelope-from joe@truespeed.com) Received: from mail.karthauser.co.uk (babel.karthauser.co.uk [212.13.197.151]) by mx1.freebsd.org (Postfix) with ESMTP id A817A11BC for ; Fri, 8 Apr 2016 09:03:34 +0000 (UTC) (envelope-from joe@truespeed.com) Received: from dspam (babel.karthauser.co.uk [212.13.197.151]) by mail.karthauser.co.uk (Postfix) with SMTP id E66C66EE for ; Fri, 8 Apr 2016 09:03:33 +0000 (UTC) Received: from [192.168.0.235] (unknown [31.210.27.66]) (Authenticated sender: joemail@tao.org.uk) by mail.karthauser.co.uk (Postfix) with ESMTPSA id 96BDE6EA; Fri, 8 Apr 2016 09:03:25 +0000 (UTC) Subject: Re: IPFW with NAT : Problems with duplicate packets on FreeBSD 10.3-RC3 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) From: Dr Josef Karthauser In-Reply-To: <20160408154100.E39547@sola.nimnet.asn.au> Date: Fri, 8 Apr 2016 10:03:25 +0100 Cc: FreeBSD Stable , freebsd-net@freebsd.org Message-Id: References: <20160408154100.E39547@sola.nimnet.asn.au> To: Ian Smith X-Mailer: Apple Mail (2.2104) X-DSPAM-Result: Innocent X-DSPAM-Processed: Fri Apr 8 09:03:33 2016 X-DSPAM-Confidence: 0.9899 X-DSPAM-Probability: 0.0000 X-DSPAM-Signature: 570773e531276290897687 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.21 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Apr 2016 09:03:35 -0000 > On 8 Apr 2016, at 06:51, Ian Smith wrote: >=20 > On Thu, 7 Apr 2016 17:08:38 +0100, Dr Josef Karthauser wrote: >=20 > [ AppleMail msgs fail to quote properly in pine, so a partial quote: ] >=20 >> Looks like the first packet is being retransmitted, which means that=20= >> the nat is probably misconfigured and the TCP connection is broken in >> some strange way. >=20 >> Does anyone have a clue as to where to look? The ipfw rules are >> simple enough - what have I missed? >=20 > Do you have TSO enabled on that NIC? If so, see ipfw(8) BUGS, third=20= > last para. If not, no idea .. >=20 Thanks Ian, It was exactly that issue! I wish I had remembered that I=E2=80=99d seen = that in the man page; would have saved hours of debugging :) Joe =E2=80=94=20 Dr Josef Karthauser Chief Technical Officer (01225) 300371 / (07703) 596893 www.truespeed.com / theTRUESPEED=20 @theTRUESPEED =20