Date: Thu, 17 Aug 2000 10:12:29 -0600 (MDT) From: Nate Williams <nate@yogotech.com> To: sthaug@nethelp.no Cc: dhw@whistle.com, achilov@granch.ru, Egon.Rath@lsr-ooe.gv.at, freebsd-security@FreeBSD.ORG Subject: Re: AW: deny incoming icmp Message-ID: <200008171612.KAA23225@nomad.yogotech.com> In-Reply-To: <57904.966523813@verdi.nethelp.no> References: <200008171414.HAA02662@pau-amma.whistle.com> <57904.966523813@verdi.nethelp.no>
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> > >Traceroute uses ICMP types 0 (Echo Reply), 8 (Echo request) and 11 (TTL > > >expired) to determine the route to the host. > > > > That didn't seem quite right to me, so I looked (in > > /usr/src/contrib/traceroute/traceroute.c); there is a rather large > > comment block near the beginning of the file tagged > > > > * -- Van Jacobson (van@ee.lbl.gov) > > * Tue Dec 20 03:50:13 PST 1988 > > > > that explains how & why the program uses high-numbered UDP datagrams for > > the probes. It does rely on ICMP (time exceeded; ICMP type 11) for > > receiving notification from a router, though. > > The Microsoft implementation of traceroute uses ICMP instead of UDP > though... Not as far as I can tell, since it wouldn't work with my firewall if it did. However, I haven't done any explicit testing to see what exactly it does. Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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