The problem that I'm having at present is understanding how to set up the networking and network interfaces.

In asking for your help I am going to present a diagram of what I want and the stuff I've got so far for the 4 boxes that we have made up so far.  

This page will also become a repository for my research along the way.

I am finding Debian 3.1 much harder to configure and understand than the set up on Clark Connect 3.2 (which is all done using a very nice web interface).  However Debian 3.1 seems more flexiable and my requirments are well beyond what can be done with in Clark Connect 3.2 Home edition at this time.     

Resources: 

 http://www.debian.org/

http://www.debian.org/doc/manuals/reference/ch-gateway.en.html

http://documents.made-it.com/Debian_Internet_Server/Debian_Internet_Server-5.html

http://www.maths.cam.ac.uk/lapnet/deb/

http://david.decotigny.free.fr/libre/ibook2-debian/etc/network/interfaces

http://packages.debian.org/unstable/net/iptables 

http://www.rexx.com/~dkuhlman/iptables_install.html

http://www200.pair.com/mecham/spam/debian-smtp-firewall.html

http://www.howtoforge.com/linux_iptables_sarge