Date: Thu, 17 Aug 2000 12:11:07 -0300 (ART) From: Fernando Gleiser <fgleiser@cactus.fi.uba.ar> To: Egon.Rath@lsr-ooe.gv.at Cc: achilov@granch.ru, freebsd-security@FreeBSD.ORG Subject: Re: AW: deny incoming icmp Message-ID: <Pine.BSF.4.21.0008171140430.83893-100000@cactus.fi.uba.ar> In-Reply-To: <C96996C3D753D311A5400001FAF86B258E2A08@ntli02-003.lsr-ooe.gv.at>
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On Thu, 17 Aug 2000 Egon.Rath@lsr-ooe.gv.at wrote: > > |> > |> What type of ICMP messages uses traceroute? I'd like to mask > |> internal network structure from > |> tracing... > |> -- > > Traceroute uses ICMP types 0 (Echo Reply), 8 (Echo request) and 11 (TTL > expired) to determine the route to the host. That's winblows traceroute. Unix traceroute uses UDP instead of icmp echo. The icmp that come back are 11/0 (time exeeded in transit) and several type 3 (host unreach, net unreach, and port unreach.) . take a look at http://www.kohala.com/start/papers.others/vanj.99feb08.txt to see why. > Yours, Egon > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-security" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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