From owner-freebsd-net Wed Jan 29 14:12:55 2003 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 D6B3E37B401; Wed, 29 Jan 2003 14:12:53 -0800 (PST) Received: from heron.mail.pas.earthlink.net (heron.mail.pas.earthlink.net [207.217.120.189]) by mx1.FreeBSD.org (Postfix) with ESMTP id 739C543FC3; Wed, 29 Jan 2003 14:12:51 -0800 (PST) (envelope-from tlambert2@mindspring.com) Received: from pool0131.cvx22-bradley.dialup.earthlink.net ([209.179.198.131] helo=mindspring.com) by heron.mail.pas.earthlink.net with asmtp (SSLv3:RC4-MD5:128) (Exim 3.33 #1) id 18e0Rs-0007ad-00; Wed, 29 Jan 2003 14:12:49 -0800 Message-ID: <3E385188.F3404260@mindspring.com> Date: Wed, 29 Jan 2003 14:11:20 -0800 From: Terry Lambert X-Mailer: Mozilla 4.79 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Audsin Cc: freebsd-hackers@freebsd.org, freebsd-net@freebsd.org Subject: Re: Changing the Maximum Segment Size (MSS) of Kame MIP6 FreeBSD4.4 References: <5.2.0.9.0.20030129102140.00ae60a0@pop2.kcl.ac.uk> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-ELNK-Trace: b1a02af9316fbb217a47c185c03b154d40683398e744b8a47e512cc7f6a22f6bd971795d613311832601a10902912494350badd9bab72f9c350badd9bab72f9c Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Audsin wrote: > I am Dev, doing my research in Centre for Telecommunications Research, > King's college London. My research project involves evaluating the > performance of MIP6 TCP in the presence of fragmentation and without > fragmentation. I am using Kame MIP6 for Free BSD 4.4 and have configured > gif0 interface for ipv6ip tunnel. I wish to change the Maximum segment size > of the TCP. Can you please help me , where i should change the MSS of the > TCP. Can you tell me where the default size of the MSS mentioned? man ifconfig /mtu It sounds like you are trying to do something you don't have an idea of how to do. In general, this isn't a bad thing for a student to do, but you should probably read the source code and the RFC's and understand them well enough that you understand the effect of an intermediate MTU on the MSS, and what the MSS is vs. your trying to throttle it, and how one effects the other. My hunch is that you are wanting to have an intermediate link that is a fragmentation bottleneck, given what you say you are studying. Don't expect a lot of help from these lists until after you are asking questions that indicate you've read the standards and the current code. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message