Date: Fri, 20 Aug 2004 12:06:15 -0600 From: Gregory Kuhn <freebsd-net@lists.ctch.net> To: freebsd-net@freebsd.org Subject: Re: Traceroute Anomaly Message-ID: <6.1.2.0.2.20040820115837.02a21618@mail.ctch.net> In-Reply-To: <20040820173009.4A6CBF987@gemini.nersc.gov> References: <20040820173009.4A6CBF987@gemini.nersc.gov>
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At 11:30 AM 8/20/2004, you wrote:
>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,
Thank you. That was it. Changed net.inet.udp.blackhole=1 to
net.inet.udp.blackhole=0 and traces work. I'll remember to read the man
pages more closely too next time.
Greg
> --eli
>
>
>
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