From owner-freebsd-net@FreeBSD.ORG Fri May 19 19:37:40 2006 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4CE9416A429 for ; Fri, 19 May 2006 19:37:40 +0000 (UTC) (envelope-from mike@sentex.net) Received: from smarthost1.sentex.ca (smarthost1.sentex.ca [64.7.153.18]) by mx1.FreeBSD.org (Postfix) with ESMTP id ACC9143D48 for ; Fri, 19 May 2006 19:37:39 +0000 (GMT) (envelope-from mike@sentex.net) Received: from lava.sentex.ca (pyroxene.sentex.ca [199.212.134.18]) by smarthost1.sentex.ca (8.13.6/8.13.6) with ESMTP id k4JJbdKN018538; Fri, 19 May 2006 15:37:39 -0400 (EDT) (envelope-from mike@sentex.net) Received: from simian.sentex.net (simeon.sentex.ca [192.168.43.27]) by lava.sentex.ca (8.13.3P/8.13.3) with ESMTP id k4JJbbco095771 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 19 May 2006 15:37:37 -0400 (EDT) (envelope-from mike@sentex.net) Message-Id: <6.2.3.4.0.20060519153601.117978c0@64.7.153.2> X-Mailer: QUALCOMM Windows Eudora Version 6.2.3.4 Date: Fri, 19 May 2006 15:37:51 -0400 To: Chuck Swiger , freebsd-net@freebsd.org From: Mike Tancsa In-Reply-To: <446E1D41.9070301@mac.com> References: <446E1868.8020704@elischer.org> <446E1D41.9070301@mac.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Virus-Scanned: by amavisd-new Cc: Subject: Re: improving transport over lossy links ? 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, 19 May 2006 19:37:40 -0000 At 03:32 PM 19/05/2006, Chuck Swiger wrote: >Agreed. If you can live with doing so, using an MTU of around 512 >worked pretty well back in the days that I was using a 19200 baud >DOV (data over voice modem) that tended to experience line noise & >hence packet drops when you got an incoming voice call; if you've >got a high-noise environment, well, that would be similar. > >Of course, you should make sure that obvious fixes like replacing >phone cabling or re-punching down the phone lines at your demarc >(assuming you have 66 or 110 blocks) doesn't help. Thanks, unfortunately, these are very remote sites in industrial and rural areas where xconnect boxes tend to be rusty posts. I will try a lower MTU size to see how it deals with errors. ---Mike