Date: Fri, 22 Jun 2001 22:23:30 -0300 (ART) From: Fernando Gleiser <fgleiser@cactus.fi.uba.ar> To: alexus <ml@db.nexgen.com> Cc: <freebsd-security@FreeBSD.ORG> Subject: Re: disable traceroute to my host Message-ID: <20010622221554.K5703-100000@cactus.fi.uba.ar> In-Reply-To: <006a01c0fb6b$2d64d830$9865fea9@book>
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On Fri, 22 Jun 2001, alexus wrote: > is it possible to disable using ipfw so people won't be able to traceroute > me? I don't know if it is posible with ipfw, but with ip filter you can add a rule to block any packets with ttl=1: block in log quick on xl0 ttl 1 proto ip all That will stop windows traceroute (icmp based) as well as unix traceroute (udp based). Unix traceroute uses udp packets with destination port > 33434, but this can be changed. As far as I know, the only way to stop traceroute is to drop any packet with ttl=1. This might block legitimate trafic, but I haven't seen any packet in the wild with ttl=1 wich was not a traceroute. Hope this helps. Fer > > > > 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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