From owner-freebsd-questions Thu Aug 13 15:18:41 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id PAA29157 for freebsd-questions-outgoing; Thu, 13 Aug 1998 15:18:41 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from mercury.jorsm.com (mercury.jorsm.com [207.112.128.9]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id PAA29152 for ; Thu, 13 Aug 1998 15:18:40 -0700 (PDT) (envelope-from jer@jorsm.com) Received: from localhost (jer@localhost) by mercury.jorsm.com (8.8.7/8.8.7) with SMTP id RAA23867; Thu, 13 Aug 1998 17:18:05 -0500 (CDT) Date: Thu, 13 Aug 1998 17:18:04 -0500 (CDT) From: Jeremy Shaffner To: "Bruce A. Mah" cc: freebsd-questions@FreeBSD.ORG Subject: Re: Traceroutes to Cisco Routers In-Reply-To: <199808131833.LAA25384@stennis.ca.sandia.gov> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, 13 Aug 1998, Bruce A. Mah wrote: > Jeremy-- > > I just did a couple of quick experiments at my lab. In these, traceroutes > from a FreeBSD 2.2.7-RELEASE box to a Cisco 7500 (IOS 11.2(13)) are missing > the second of the three ICMP responses, as you saw. But so did traceroutes > run from a Sun Ultra 2 (Solaris 2.5.1), and an Alpha (OSF/1 3.2). > > I bet the Cisco box has some kind of rate-limiting for ICMP packets. I seem > to remember that Solaris boxes do this too, tentatively confirmed by a couple > of traceroutes I just ran now. My gut feeling is that this isn't really a > FreeBSD problem, but perhaps someone else more knowledgeable can give an > authoritative answer. > > Bruce. > > PS. Why do traceroutes past the Cisco work fine? They're different ICMP > error messages ("TTL expired", as opposed to "port unreachable"), probably > generated by different codepaths in IOS. > The only thing that doesn't jive is that traces from non Unix machines are fine. -===================================================================- Jeremy Shaffner JORSM Internet Senior Technical Support Northwest Indiana's Premium jer@jorsm.com Internet Service Provider support@jorsm.com http://www.jorsm.com -===================================================================- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message