[CentOS] Build a Firewall (Can I learn to do this...)

ML wrote:
> Can anyone offer advice?
>   

pfSense. 

can even boot it off a CD and use a USB flash stick for configuration 
storage so you don't need a hard drive.  or boot it off a 128MB CF 
card.  doesn't need a display after initial setup (actually, can even be 
configured with a serial terminal in a truly embeded configuration).  
once its up and running, its configured via web browser.