network issue

[Matt_T_hat]

I have a dual PII box that I fancied reserecting as a server.

I have gotten basic debian on it and booted as far as APT to grab the rest enough to make it a test and development webserver for my own personal use.

Debian is behaving very but the link to the outside world is not working.

The Deb PC is on a local LAN via a 8 port 10/100 switch with an XP PC.

The XP PC has an additional WiFi card and connects to the Wireless Access Point.

The WAP is connected via ethernet to a 4 port switched hub and router which connects to my 2Mbit ADSL.

A small hack to the registry causes the XP box to route for the first LAN onto the second LAN.

LAN #1 - WiFi - LAN #2 - ADSL

The XP box and the Deb box (apart from using a KVM) can ping each other nicely.

The Debian Box can ping the WiFi Access Point and even the router.

It can not ping Google or my PC in the living room (LAN # 2) the packets are going but they are not coming back.

Interestingly the XP PC also runs apache 2 and php and I test my plugins on it. I can not ping the PC by name only IP address.

LAN #1 has IPs that follow the pattern 192.168.144.x (Class C private IPs) masked 255.255.255.0

LAN # 2 has IPs dished out by the router DHCP that follow 10.0.0.x (Class A private block) masked 255.0.0.0

The router is at 10.0.0.2 and the WAP at 10.0.0.1 no unit has an IP about 10.0.0.20 (custom limit).

The router has a built in firewall and allows all of Class A and Class C private blocks in both directions.

What have I missed?

UPDATE: I have successfulyl pinged 10.0.0.6 (which I assume is the IP of my wifes PC on LAN #2) from the debian PC.