Firewall machine is running debian linux - have no idea what version at the moment, it used to be woody but things have been changed and updated so many times on it... I would consider putting something else in but the machine is also my asterisk machine.
Just need a basic howto on setting it up to do the following
bridge 2 nics together - one my stuff, one the AP to the other guys
Give them second priority for anything going onto the internet when compared to my machines, but allow for full speed between the lans.