Hello,
After a rollercoaster day I have managed to get my box running as a router. I will add the firewall rules tomorrow.
Initially I had Lenny installed in it without desktop. However whenever I tried to give a NAT command it said it could not locate the `NAT´ table and I might need insmod etc. etc. I spent the entire evening looking up google, even asking a friend but no solution could be found. Different modules were loaded but no result. Finally I tried a live Kubuntu 9.04 cd and tried the command and it did not return errors. Lenny was removed and Kubuntu was installed. However at one time I got the error again, thats when I realised that the syntax for nat was lowercase not uppercase as I kept doing. I felt very stupid to have wasted a day over a syntax error. But it was a good learning experience. I found kdm was very sticky to Kubuntu so I reloaded lenny again and set everything to make the system work as a router. Tomorrow I will add more rules for restrictive access.
I am sending this mail from a lappy connected to the box.