Re: Traceroute not working through gshield NAT
On Thu May 01, 2003 at 05:23:07PM -0700, nate wrote:
> Bill Moseley said:
> > $ traceroute debian.org
> > traceroute to debian.org (220.127.116.11), 30 hops max, 38 byte packets
> > 1 * * *
> traceroute -n www.debian.org
> traceroute -I www.debian.org
No, it's not that. The traceroute just isn't getting through my gshield firewall, and I'm
wondering how to config gshield to allow traceroute.
I can run traceroute from the Firewall/NAT machine just fine, just not from within the
If I run
# /etc/init.d/gshield stop
# iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to $external_ip
then I can run traceroutes from inside the NAT'ed network. So gsheild is blocking.
Ping, on the other hand, does work from inside the net.
And setting in gshield:
does not log the blocked traceroute.
So, so in summary, with gshield running:
>From the Firewall/NAT machine I can ping and traceroute to both internal and external hosts.
>From the internal machines I can ping everywhere. I can only traceroute as far as the