From owner-freebsd-stable@FreeBSD.ORG Mon Jul 23 19:09:39 2012 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 36273106564A for ; Mon, 23 Jul 2012 19:09:39 +0000 (UTC) (envelope-from healer@rpi.edu) Received: from smtp7.server.rpi.edu (smtp7.server.rpi.edu [128.113.2.227]) by mx1.freebsd.org (Postfix) with ESMTP id D09628FC0C for ; Mon, 23 Jul 2012 19:09:38 +0000 (UTC) Received: from [128.113.208.176] (vpn-208-176.net.rpi.edu [128.113.208.176]) (authenticated bits=0) by smtp7.server.rpi.edu (8.13.1/8.13.1) with ESMTP id q6NHwSEq019702 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 23 Jul 2012 13:58:28 -0400 Message-ID: <500D90C5.2020208@rpi.edu> Date: Mon, 23 Jul 2012 13:58:29 -0400 From: Bob Healey User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20120614 Thunderbird/13.0.1 MIME-Version: 1.0 To: freebsd-stable@freebsd.org References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Bayes-Prob: 0.0001 (Score 0) X-RPI-SA-Score: 1.40 (*) [Hold at 11.00] RATWARE_GECKO_BUILD, 24027(0), 22490(-25) X-CanItPRO-Stream: outgoing X-Canit-Stats-ID: 51225517 - 4c471490a385 X-Scanned-By: CanIt (www . roaringpenguin . com) on 128.113.2.227 Subject: Re: pxeboot with jumbo frame network X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Jul 2012 19:09:39 -0000 I know I have this working, however I don't remember what I did. I know I can pxeboot and install RHEL on a 9K frame network from a FreeBSD tftp server/NAT gateway. I do know the first thing in my RHEL install script is to set the MTU to 9K. If I have a chance later today, I'll dig into one of my install servers and try to figure out what options I used with DHCP to get it working. Sorry I can't be of more help than to say its possible. Bob Healey Systems Administrator Biocomputation and Bioinformatics Constellation and Molecularium healer@rpi.edu (518) 276-4407 On 7/23/2012 1:31 PM, Robert Blayzor wrote: > Is it possible to PXEboot a diskless client with an MTU higher than 1500 (Ie: 9k) ? > > The network we currently boot several diskless machines from has a lot of NFS traffic and we'd like to enable them all for larger MTU's however the one thing stopping us is the issue with initial boot seemingly only supporting an MTU of 1500. > > I know we can set the MTU later (post boot) on the diskless machines, but it doesn't seem we can run a higher MTU on the TFTP server as we'd have TFTP UDP traffic with mis-matched frame sizes at that point. >