Re: traceroute problems**That Works

["David Leathers" <dleathers@charter.net>]

Thanks mike808. The -I option works.  It worked with the firewall off and
on.

So does that mean that I need to put a rule in iptables about using UDP
packets on ports 33434-33523 or just use traceroute with the -I switch?

Guess I need to do some reading about the whole process.  That would be ICMP
packets, UDP packets, iptables How To, Networks How To, and traceroute. That
should keep me out of trouble for awhile.
----- Original Message -----
From: <mike808@users.sourceforge.net>
To: <silug-discuss@silug.org>
Sent: Wednesday, December 25, 2002 1:31 PM
Subject: Re: traceroute problems


> > About to pull what little hair I have left out trying to run tracerout
> > in rh8.  When I run traceroute I get 1.*** 2.*** and so on.  I tried
> > shutting down the firewall that does not help.  I did a iptables -L and
> > there is a post that icmp port is unreachable.  Something is blocking
> > it.  I am on cable with a router not sure if that has anything to do
> > with it.  I dual boot windows and traceroute runs ok in windows so i
> > don't think it is the router.
> >
> > Anyone know how I can solve this or where to look for information?
>
> This is the perennial "ping uses ICMP packets, traceroute uses UDP packets
> in a specific port range".
>
> Try using the "-I" option for traceroute. This makes it use ICMP packets
> instead of UDP packets.
>
> Your firewalls need to allow UDP traffic on ports 33434 - 33523 to use
> the normal mode.
>
> See http://www.samspade.org/d/faq for an overview.
>
> Mike808/
>
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