Re: 5 "Advanced" networking questions

From: Socketd (db_at_traceroute.dk)
Date: 07/07/03

  • Next message: Leo Bicknell: "tcsh / tset problem on 4.7 only?" 
    Date: Mon, 7 Jul 2003 18:02:52 +0200
To: Toni Andjelkovic <toni@soth.at>, hackers@freebsd.org

    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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