[Ham-Linux] firewall/router

[Jonathan Thawley, KC8CPW]

I'm trying to setup my linux box to be my firewall and router...  I do have
2 NICs installed....  
 
specifically which programs do I need to use to bridge those 2 NIC cards
together so that I can access the internet
 
I believe that I also need the DHCP server or something like that running...
what is the correct service name for that tool??
 
also, I need to know how to open up specific ports, such as those for
EchoLink, etc, etc...
 
I also have SeLinux installed (I think that's what it's called) not sure
what to do with it...
 
I'm using TAO LINUX.... www.taolinux.org  it's based off of red hat....
 
and ideas or suggestions are appreciated.
 
 
Jonathan/KC8CPW