[CentOS] CentOS or other Linux Internet Router/Gateway

Thanks everyone. "Firewall" was the term I was having trouble coming
up with. Now I'm overwhelmed with all the choices. I think, for
someone as "green" (as in "inexperienced") as I am, something like
IPCop might be an easy place to start. I'll experiment with a Pentium
III I have, but will probably work towards some kind of fanless,,
small computer (as suggested by another poster). I'm not sure the BSD
firewalls will work for me (at this point) because I've got a couple
Linux add-ins I'm thinking of using.

Just to confirm. The Linksys wireless router can become a wireless
switch with the firewall and router capabilities disabled. (This is a
Linux version, BTW, so I'm also going to look into the firmware
modifications, but I doubt I can load my programs there and am a
little nervous about bricking the router).

Again, thanks.

-- 
RonB -- Using CentOS 5.5