Date: Fri, 20 Aug 2004 10:30:09 -0700 From: Eli Dart <dart@nersc.gov> To: Gregory Kuhn <freebsd-net@lists.ctch.net> Cc: freebsd-net@freebsd.org Subject: Re: Traceroute Anomaly Message-ID: <20040820173009.4A6CBF987@gemini.nersc.gov> In-Reply-To: Message from Gregory Kuhn <freebsd-net@lists.ctch.net> <6.1.2.0.2.20040820102349.02ac6440@mail.ctch.net>
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--==_Exmh_1944362035P Content-Type: text/plain; charset=us-ascii In reply to Gregory Kuhn <freebsd-net@lists.ctch.net> : > Hello, > > > I have discovered an anomaly (I am sure it was discovered long > ago) when trying to traceroute to my FBSD 4.8 and 4.9 servers. Here are > the details. Have you set sysctl net.inet.udp.blackhole=1 ? If so, the FreeBSD box will drop the traceroute UDP probes and you'll never see the host itself in traceroute output. --eli --==_Exmh_1944362035P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) Comment: Exmh version 2.5 07/13/2001 iD8DBQFBJjUhLTFEeF+CsrMRAp42AJwKRHsYvmbmH04Z9p3vdypMzVF8gACggiE1 KidS3bvOKdlwryGGcUr34yE= =L47u -----END PGP SIGNATURE----- --==_Exmh_1944362035P--
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