LAN Firewalling

[Justin Soong]

Hello guys,   I am planning to home network serveral Windows Computers @ my home. I'll be using a ADSL router and a switch to share a connection.   Will I be able to use a Linux computer as a firewall for the Windows Machines? I'm new to Linux and can someone explain how this firewalling business works. If you have experience can you tell be whether the firewall server would be part of the network or before the hub/switch.   Thanks   Justin (keep warm)brrrrrr..........