What about the *Block private networks* option on the Interfaces: WAN page? 
I haven't used such a setup myself, but the description says:
When set, this option blocks traffic from IP addresses that are reserved for 
private networks as per RFC 1918 (10/8, 172.16/12, 192.168/16) as well as 
loopback addresses (127/8). You should generally leave this option turned 
on, unless your WAN network lies in such a private address space, too.
 
-klode

On 6/20/05, Chris Buechler <cbuechler at gmail dot com> wrote:
> 
> On 6/20/05, Jared Patterson (DSL AK) <JaredP at datacom dot co dot nz> wrote:
> > Currently from the machine in the internal network, I can ping the Lan
> > Card & Wan Card, but I cannot ping the DSL Router?? But, from the
> > diagnostics tool on M0n0, it can ping the DSL router with no problems.
> > Where or what am I doing wrong????
> 
> Can you get to the Internet from m0n0wall itself? Try pinging
> google.com <http://google.com> or something. Have DNS servers entered into 
> m0n0wall?
> Seeing anything dropped in your firewall logs?
> 
> -Chris
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