From owner-freebsd-net@FreeBSD.ORG Fri Apr 4 20:35:19 2008 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0539F106566C for ; Fri, 4 Apr 2008 20:35:19 +0000 (UTC) (envelope-from prvs=1980632278=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (core6.multiplay.co.uk [85.236.96.23]) by mx1.freebsd.org (Postfix) with ESMTP id 6658D8FC23 for ; Fri, 4 Apr 2008 20:35:18 +0000 (UTC) (envelope-from prvs=1980632278=killing@multiplay.co.uk) DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=multiplay.co.uk; s=Multiplay; t=1207340568; x=1207945368; q=dns/txt; h=Received: Message-ID:From:To:References:Subject:Date:MIME-Version: Content-Type:Content-Transfer-Encoding; bh=UlwVX3KY6i5xelXrU7E5J P8w5c6u5MSvyyHV/ySybxU=; b=heM3UbkIpx+CEPsyPviWP2QNkG7671HUrR5zA WAcW2/8GEH84Iq5djCZ7QJ76H2yjIk94SrNpMuWC70Xy2x+7uzCL8IMFlntbPqRw JG/Ivh5pVb6jPqPm5h5xpBaSiD5IHIgkYGnYY1qCqexNBTLsXBvW6ds9H4y0v+de RNukkg= X-Spam-Checker-Version: SpamAssassin 3.1.8 (2007-02-13) on mail1.multiplay.co.uk X-Spam-Level: X-Spam-Status: No, score=-14.7 required=6.0 tests=BAYES_00, USER_IN_WHITELIST, USER_IN_WHITELIST_TO autolearn=ham version=3.1.8 Received: from r2d2 by mail1.multiplay.co.uk (MDaemon PRO v9.6.3) with ESMTP id md50005435917.msg for ; Fri, 04 Apr 2008 21:22:46 +0100 Message-ID: <021701c89691$a3306020$3d010a0a@multiplay.co.uk> From: "Steven Hartland" To: "s3raphi" , References: <47D860AC.6030707@freebsd.org> <16497816.post@talk.nabble.com> Date: Fri, 4 Apr 2008 21:22:42 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Authenticated-Sender: Killing@multiplay.co.uk X-MDRemoteIP: 85.236.96.60 X-Return-Path: prvs=1980632278=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-net@freebsd.org X-Spam-Processed: mail1.multiplay.co.uk, Fri, 04 Apr 2008 21:22:47 +0100 X-MDAV-Processed: mail1.multiplay.co.uk, Fri, 04 Apr 2008 21:22:48 +0100 Cc: Subject: Re: TCP options order changed in FreeBSD 7, incompatible with some routers X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Apr 2008 20:35:19 -0000 I believe this has already been covered in quite some depth and iirc its regards the ordering of the new tcp flags introduced in 7. Best to have a look in the list archives for the specifics. Regards Steve ----- Original Message ----- From: "s3raphi" > > I upgraded many web servers to FreeBSD 7.0-Release several weeks ago. These > servers serve hundreds of thousands of users. Since then, we have had many > users complain that they cannot connect to these servers any more. This was > a very tricky problem to diagnose, but using packet captures on both the > servers and the clients who have the problem I ended up with the same > results as the original poster. The user can ping the server with ICMP. The > user cannot complete a TCP connection. > Client sends SYN to server > Server responds SYN/ACK > Client packet capture does not show the SYN/ACK arrive. > Connection fails. .... ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.