From owner-freebsd-questions@FreeBSD.ORG Sat Jun 30 23:05:28 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id ED54716A468 for ; Sat, 30 Jun 2007 23:05:28 +0000 (UTC) (envelope-from modulok@gmail.com) Received: from py-out-1112.google.com (py-out-1112.google.com [64.233.166.178]) by mx1.freebsd.org (Postfix) with ESMTP id ADE4213C455 for ; Sat, 30 Jun 2007 23:05:28 +0000 (UTC) (envelope-from modulok@gmail.com) Received: by py-out-1112.google.com with SMTP id u77so2143389pyb for ; Sat, 30 Jun 2007 16:05:28 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=NLiGOOgSBroGMOcRxpNawxKLxjVFN0sO522obeK/pgLVULT/5dH71+UoSBjofGdhresu/c6fo8r5MAlRa0MpQiCYuDRNmKQTLXzLEtzaHjuFxpgEnw4tZHpb6lUdUAQDgpQlj1VhivxtZ3rBE73F+MGdNHMc4BhWynhdMEiznoU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=fCJi/jekqwJoy6gb/FFqA7mdpxN0WiGGLu2Ai4csaweBDNd9EoPafKcNivso/KD+XWXuI0HfBKqo+cXWBq+FcrFSDBd9xXJABNUNDTVtwME2PJnfN0WKB5WDdWjvqzXXWIXKVHijzfd/Uu/GJReyRYwEngXIbxGrmq1amGWMmQo= Received: by 10.141.190.9 with SMTP id s9mr1051521rvp.1183244727583; Sat, 30 Jun 2007 16:05:27 -0700 (PDT) Received: by 10.140.170.12 with HTTP; Sat, 30 Jun 2007 16:05:27 -0700 (PDT) Message-ID: <64c038660706301605o7cdcd24fvb03af4167d5ca49@mail.gmail.com> Date: Sat, 30 Jun 2007 17:05:27 -0600 From: Modulok To: "chloe K" In-Reply-To: <128191.89983.qm@web57414.mail.re1.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <128191.89983.qm@web57414.mail.re1.yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: MTU question 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: Sat, 30 Jun 2007 23:05:29 -0000 On 6/30/07, chloe K wrote: > Hi all > > ls our network provider insists to set the mtu to 1600? but I can only set > the freebsd as 1500. > > ls there any network issue? > > thank you A value of 1600 is not standard compliant. A value of 1500 is the largest MTU for standard ethernet, as stated in RFC 894 - "A Standard for the Transmission of IP Datagrams over Ethernet Networks", and RFC 1191 - "Path MTU discovery." Perhaps your provider is confused? RFC 894: "...the maximum length of an IP datagram sent over an Ethernet is 1500 octets." As far as overriding this to a higher value, you may be restricted in doing so by your hardware, as stated in the ifconfig(8) manpage, "...Not all interfaces support setting the MTU, and some interfaces have range restrictions." -Modulok-