Date: Mon, 7 Jul 2003 18:02:52 +0200 From: Socketd <db@traceroute.dk> To: Toni Andjelkovic <toni@soth.at>, hackers@freebsd.org Subject: Re: 5 "Advanced" networking questions Message-ID: <20030707180252.44036c61.db@traceroute.dk> In-Reply-To: <20030707153314.GA1695@webboy.soth.at> References: <20030707012205.3103dfc8.db@traceroute.dk> <20030707153314.GA1695@webboy.soth.at>
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On Mon, 7 Jul 2003 17:33:14 +0200 Toni Andjelkovic <toni@soth.at> wrote: > On Mon, Jul 07 2003 (01:22:05 +0200), Socketd wrote: > > 1. Reading "man blackhole" I found that net.inet.udp.blackhole=1 > > will prevent traceroute. Is this only if the host is the end target? > > or will it simply disable sending an ICMP packet when it get's a > > packet with ttl=1? > > Look in sys/netinet/udp_usrreq.c. This flag operates on the UDP layer > and doesn't interfere with TTLs. Ok, anyway to prevent sending ICMP's when ttl = 0? Or do I need a firewall? Thank you for your reply! br socketd
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