From owner-freebsd-net@FreeBSD.ORG Mon Jul 16 16:56:16 2007 Return-Path: X-Original-To: freebsd-net@freebsd.org Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 81AA316A400 for ; Mon, 16 Jul 2007 16:56:16 +0000 (UTC) (envelope-from Stephen.Clark@seclark.us) Received: from smtpauth03.prod.mesa1.secureserver.net (smtpauth03.prod.mesa1.secureserver.net [64.202.165.183]) by mx1.freebsd.org (Postfix) with SMTP id 2FBA313C4A3 for ; Mon, 16 Jul 2007 16:56:16 +0000 (UTC) (envelope-from Stephen.Clark@seclark.us) Received: (qmail 19091 invoked from network); 16 Jul 2007 16:56:13 -0000 Received: from unknown (24.144.77.243) by smtpauth03.prod.mesa1.secureserver.net (64.202.165.183) with ESMTP; 16 Jul 2007 16:56:13 -0000 Message-ID: <469BA32D.8040706@seclark.us> Date: Mon, 16 Jul 2007 12:56:13 -0400 From: Stephen Clark User-Agent: Mozilla/5.0 (X11; U; Linux 2.2.16-22smp i686; en-US; m18) Gecko/20010110 Netscape6/6.5 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Wes Peters References: <46967C5C.5040505@seclark.us> <469772DA.1000700@gmail.com> <46977741.8090301@seclark.us> <4698D290.5080004@gmail.com> <46992021.8090603@seclark.us> <469B9516.2090904@gmail.com> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-net@freebsd.org, Sten Daniel Soersdal Subject: Re: 6.2 mtu now limits size of incomming packet X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Stephen.Clark@seclark.us List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Jul 2007 16:56:16 -0000 Wes Peters wrote: >On 7/16/07, Sten Daniel Soersdal wrote: > > >>I guess it wouldn't hurt for the operating system to accept larger >>frames, as long as only the correctly sized frames are transmitted. >> >>There are alot of people, including myself, that assume a host can't >>receive a frame that is larger than MTU. Perhaps it should be noted in >>the man pages about this behavior in addition? >> >> > >I've bumped into this issue several times before. A look at the >ifconfig man page will show a way to set the interface mtu, but not >the mru. FreeBSD has always used the mtu as the mru for the > > This is not the case in FreeBSD 4.9 - It would gladly accept packets on an interface that were larger than the MTU for that interface. >interface, which is arguably wrong. In every case I've encountered >this problem, the user had truly mis-configured some part of the >network and correct configuration solved the problem, so I've never >been fully convinced it needed to be fixed. > > > > -- "They that give up essential liberty to obtain temporary safety, deserve neither liberty nor safety." (Ben Franklin) "The course of history shows that as a government grows, liberty decreases." (Thomas Jefferson)