From owner-freebsd-questions Thu Feb 20 0:46:22 2003 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 9933837B401 for ; Thu, 20 Feb 2003 00:46:21 -0800 (PST) Received: from hotmail.com (f71.law14.hotmail.com [64.4.21.71]) by mx1.FreeBSD.org (Postfix) with ESMTP id 339FA43F3F for ; Thu, 20 Feb 2003 00:46:21 -0800 (PST) (envelope-from johnsonest@hotmail.com) Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Thu, 20 Feb 2003 00:46:21 -0800 Received: from 210.83.142.3 by lw14fd.law14.hotmail.msn.com with HTTP; Thu, 20 Feb 2003 08:46:20 GMT X-Originating-IP: [210.83.142.3] From: =?gb2312?B?1cUgwcE=?= To: freebsd-questions@FreeBSD.ORG Cc: gary.thomas@mind.be Subject: some question Date: Thu, 20 Feb 2003 16:46:20 +0800 Mime-Version: 1.0 Content-Type: text/plain; charset=gb2312; format=flowed Message-ID: X-OriginalArrivalTime: 20 Feb 2003 08:46:21.0090 (UTC) FILETIME=[8A9EA820:01C2D8BC] Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG hi,i have a question about tcp/ip stack,could you help me? when we send a tcp packet with tcp_maxopt(tcp_maxopt = min(my mss,mss offerd by opposite socket) +length of TCP options,as ecos does in function tcp_mss() of the file tcp_input.c) to IP,and IP insert some IP options into packet,so maybe length of whole IP packet > ifp->mtu,so Ip must fragment this tcp packet,and TCP failed to avoid fragmenting in host itsself. as we know,TCP always avoid to fragment as possible,maybe the condition above does not occur often,but it is possible. right? or wrong,please tell me,Thank you very much! BRS/johnsonest _________________________________________________________________ Ãâ·ÑÏÂÔØ MSN Explorer: http://explorer.msn.com/lccn/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message