A long time ago I setup a Linux machine as a Gateway/LAN Server using Verizon DSL as the ISP.
I used the following HOWTO as the guide – DSL HOWTO For Linux: http://www.tldp.org/HOWTO/DSL-HOWTO/index.html , Is there something comprable for Verizon FIOS? My Gateway machine runs Fedora.
For a new server, I’m considering setting up a CentOS machine, while still using Fedora on my desktop and laptop. FIOS comes with a FIOS router. You have straight ethernet to it.
And it you wire it right, you can set up an internal/external network config with your own firewall. (The FIOS router also acts as a firewall, but you might trust an iptables firewall more as a second line of defense.