Re: traceroute and IPFirewall

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From
O. Hartmann <ohartman@ipamzlx.physik.uni-mainz.de>
Date
26 Sep 2000 12:58:13
Subject
Re: traceroute and IPFirewall
Message-ID
Pine.BSF.4.21.0009262158560.2125-100000@ipamzlx.physik.uni-mainz.de

In reply to

[ Hide this part ]
On Tue, 26 Sep 2000, Chip Marshall wrote:
Thanks, that was the mistake! UDP has to be allowed in the specified
port range ...
:>On September 26, 2000, O. Hartmann sent me the following:
:>> have some basic questions ... We use IPFIREWALL on our boxes and
:>> ICMP is allowed to pass ... ping is possible, but no traceroute.
:>> Any ideas how to fix or to do? Thanks.
:>
:>Are you trying to disallow ping, or allow traceroute? If you're trying
:>to allow traceroute, keep in mind that the outgoing part of a
:>traceroute is a series of UDP packets, not ICMP (in FreeBSD at least.
:>I know Microsoft Windows tracert used ICMP packets.) The manpage for
:>traceroute tells the UDP port range it uses.
:>
:>--
:>Chip Marshall <chip@chocobo.cx> http://www.chocobo.cx/chip/ Finger for PGP
:>GCM/CS d+(-) s+:++ a18>? C++ UB++++$ P+++$ L- E--- W++ N+@ o K- w O M+ V--
:>PS PE Y? PGP++ t+@ 5 X R>+ tv+() b++>+++ DI++++ D(-) G++ e>++ h!>++ r-- y-
:>

Gruss O. Hartmann
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