From owner-freebsd-net@FreeBSD.ORG Fri Aug 20 17:20:26 2004 Return-Path: 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 A8F3C16A4CE for ; Fri, 20 Aug 2004 17:20:26 +0000 (GMT) Received: from out014.verizon.net (out014pub.verizon.net [206.46.170.46]) by mx1.FreeBSD.org (Postfix) with ESMTP id 37D6443D45 for ; Fri, 20 Aug 2004 17:20:24 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from [192.168.1.3] ([68.160.193.218]) by out014.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040820172023.CHB24490.out014.verizon.net@[192.168.1.3]>; Fri, 20 Aug 2004 12:20:23 -0500 Message-ID: <412632CE.5080106@mac.com> Date: Fri, 20 Aug 2004 13:20:14 -0400 From: Chuck Swiger Organization: The Courts of Chaos User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040803 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Gregory Kuhn References: <6.1.2.0.2.20040820102349.02ac6440@mail.ctch.net> In-Reply-To: <6.1.2.0.2.20040820102349.02ac6440@mail.ctch.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Authentication-Info: Submitted using SMTP AUTH at out014.verizon.net from [68.160.193.218] at Fri, 20 Aug 2004 12:20:23 -0500 cc: freebsd-net@freebsd.org Subject: Re: Traceroute Anomaly X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 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, 20 Aug 2004 17:20:26 -0000 Gregory Kuhn wrote: [ ... ] > Why can I do a traceroute using the DOS version of traceroute (tracert) > to any of my FreeBSD boxes, but I am not able to do so from another > FreeBSD box? Furthermore, it is not just from my own boxes that I am > unable to do a traceroute. Using the traceroutes listed at > www.traceroute.org I again am unable to trace back to my FBSD boxes. Different traceroute programs use different protocols; in fact, the BSD traceroute supports: -P Send packets of specified IP protocol. The currently supported protocols are: UDP, TCP, GRE and ICMP. Other protocols may also be specified (either by name or by number), though traceroute does not implement any special knowledge of their packet for- mats. This option is useful for determining which router along a path may be blocking packets based on IP protocol number. But see BUGS below. ...and if you read the rest of the manpage, it will discuss the fact that it is fairly common for traceroute to not show the last hop when using protocols other than UDP. -- -Chuck