Date: Thu, 13 Aug 1998 17:18:04 -0500 (CDT) From: Jeremy Shaffner <jer@jorsm.com> To: "Bruce A. Mah" <bmah@CA.Sandia.GOV> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Traceroutes to Cisco Routers Message-ID: <Pine.BSF.3.95q.980813171646.22777A-100000@mercury.jorsm.com> In-Reply-To: <199808131833.LAA25384@stennis.ca.sandia.gov>
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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
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