From owner-freebsd-questions@FreeBSD.ORG Thu Sep 1 18:52:42 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 78FA416A41F for ; Thu, 1 Sep 2005 18:52:42 +0000 (GMT) (envelope-from bryana@jedi.darth-vader.org) Received: from jedi.darth-vader.org (jedi.darth-vader.org [63.228.3.105]) by mx1.FreeBSD.org (Postfix) with ESMTP id D647443D45 for ; Thu, 1 Sep 2005 18:52:41 +0000 (GMT) (envelope-from bryana@jedi.darth-vader.org) Received: from jedi.darth-vader.org (localhost.darth-vader.org [127.0.0.1]) by jedi.darth-vader.org (8.13.4/8.13.4) with ESMTP id j81IqfKL001474; Thu, 1 Sep 2005 13:52:41 -0500 (CDT) (envelope-from bryana@jedi.darth-vader.org) Received: (from bryana@localhost) by jedi.darth-vader.org (8.13.4/8.13.4/Submit) id j81IqeT2001473; Thu, 1 Sep 2005 13:52:40 -0500 (CDT) (envelope-from bryana) Date: Thu, 1 Sep 2005 13:52:40 -0500 From: Bryan Albright To: Chuck Swiger Message-ID: <20050901185240.GA1423@darth-vader.org> Mail-Followup-To: Chuck Swiger , Greg Barniskis , freebsd-questions@freebsd.org References: <20050901124405.GA6432@darth-vader.org> <43171963.80502@mac.com> <20050901153458.GA39443@darth-vader.org> <43173FC9.5050707@scls.lib.wi.us> <4317447C.6030201@mac.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4317447C.6030201@mac.com> X-Priority: 3 (Normal) User-Agent: Mutt/1.5.9i X-Virus-Scanned: ClamAV 0.86.2/1051/Thu Sep 1 09:57:21 2005 on jedi.darth-vader.org X-Virus-Status: Clean X-Spam-Status: No, score=-2.8 required=5.0 tests=ALL_TRUSTED autolearn=failed version=3.0.4 X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on jedi.darth-vader.org Cc: Greg Barniskis , freebsd-questions@freebsd.org Subject: Re: How can I stop "discard oversize frame" errors? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Sep 2005 18:52:42 -0000 On 09/01/05 at 02:12PM, Chuck Swiger wrote: > Greg Barniskis wrote: > [ ... ] > >Isn't this message being generated when the router sends a packet that > >exceeds fxp0's MTU, so... the solution is to tune the router's MTU, > >rather than fxp0? I am admittedly just guessing, but intuitively that > >seems right. > > You want to tune the MTU of whatever is generating the oversize packets, > agreed. The messages in syslog do not reveal the source of the oversize > packets, but "tcpdump -n greater 1520" should. > > -- > -Chuck I appreciate all the help, thanks! Okay, I've tried running the above (tcpdump -ni fxp0 greater 1520) but I get no output. If I drop it down to 1510 (tcpdump -ni fxp0 greater 1510), I get responses from everything sized 1452 (13:47:08.929873 IP 63.231.195.31.110 > .2984: . 17520:18980(1460) ack 1 win 58400) and up. (63.231.195.31 is the pop server my wife uses to check her mail-- and note the length is at 1460, which I don't believe is enough to generate the discard oversize frame errors) However, I've even with the tcpdump running -- at any of the above size levels, I get the "discard oversize frame" errors with a "len" ranging from 1517 up to 2030. *sigh* Frustrating. Thanks again! Bryan -- Never Play Leap Frog With A Unicorn.