From owner-freebsd-net@FreeBSD.ORG Fri Aug 12 02:08:14 2005 Return-Path: X-Original-To: freebsd-net@freebsd.org 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 DF90F16A41F for ; Fri, 12 Aug 2005 02:08:14 +0000 (GMT) (envelope-from jha0147@yahoo.com) Received: from web34105.mail.mud.yahoo.com (web34105.mail.mud.yahoo.com [66.163.178.103]) by mx1.FreeBSD.org (Postfix) with SMTP id 74A2443D45 for ; Fri, 12 Aug 2005 02:08:14 +0000 (GMT) (envelope-from jha0147@yahoo.com) Received: (qmail 30075 invoked by uid 60001); 12 Aug 2005 02:08:14 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=tzObLGwLWNpAJi+DNYRxKQoQNh7CRk3144678+srKPjgtPfVC7x96Xcemhp7/0aj2mdXcHyQXwXYub7qJscQMy1/wtVJPZrs6hBwKXX4nfsnq02Eg4dMzYlqlmn3HcozFjL4Eu5qP3e5Aq/jFUQSsvbaEWbbGKDtGBFDkXzkRvc= ; Message-ID: <20050812020814.30073.qmail@web34105.mail.mud.yahoo.com> Received: from [69.236.90.193] by web34105.mail.mud.yahoo.com via HTTP; Thu, 11 Aug 2005 19:08:13 PDT Date: Thu, 11 Aug 2005 19:08:13 -0700 (PDT) From: jha miku To: freebsd-net@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Subject: Question regd timestamp option X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Aug 2005 02:08:15 -0000 In case of active open, the SYN segments always have timestamp enabled, since the RFC flg is set. But, Currently, I am seeing some SYN segments without timestamp option. The only condition that I am aware of when timestamp is disabled, is on sending the 3rd SYN in retransmit code when the timestamp gets disabled. looking at the tcpdump, it is unclear why the SYNs are sent during active open without timestamp option. Are there other situations when timestamp gets disabled? Please let me know. Thanks. ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs