From owner-freebsd-questions Mon Jul 28 16:50:50 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id QAA13508 for questions-outgoing; Mon, 28 Jul 1997 16:50:50 -0700 (PDT) Received: from freebie.lemis.com (gregl1.lnk.telstra.net [139.130.136.133]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id QAA13497; Mon, 28 Jul 1997 16:50:41 -0700 (PDT) Received: (grog@localhost) by freebie.lemis.com (8.8.6/8.6.12) id JAA02652; Tue, 29 Jul 1997 09:20:42 +0930 (CST) From: grog@FreeBSD.ORG Message-Id: <199707282350.JAA02652@freebie.lemis.com> Subject: Re: How do I determine who is blocking access? In-Reply-To: <19970728152322.04005@mpress.com> from Brian Litzinger at "Jul 28, 97 03:23:22 pm" To: brian@mpress.com (Brian Litzinger) Date: Tue, 29 Jul 1997 09:20:42 +0930 (CST) Cc: freebsd-questions@FreeBSD.ORG Organisation: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8250 Fax: +61-8-8388-8250 Mobile: +61-41-739-7062 WWW-Home-Page: http://www.lemis.com/~grog X-Mailer: ELM [version 2.4ME+ PL32 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-questions@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Brian Litzinger writes: > Somewhere between my ip and another ip someone (a firewall I > suppose) is stopping me from accessing the destination smtp > server. I can reach services on other ports. Is there a tool > that will help me locate which machine (router) is > killing the packets? You could try using traceroute. You can set the port number with the -p option, but it always uses UDP, whereas SMTP is usually a TCP service. You'll note from /etc/services, though, that smtp is also defined as the same port number for UDP, so there's a chance that you'll find the culprit with traceroute -p 25 dest-system 25 is the SMTP service number--traceroute doesn't understand the service name. Greg