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Phantom_Cyph,
Learn IPTables. You'll have to, anyway, if you want to start a career in security.
To configure your computer to be a router, and in the assumtion that you don't have a switch/hub, you'll need to have a WAN ethernet port, and an ethernet port for each client. So, in your case, with 3 computers, 1 acting as the router/firewall, you'll need 3 ethernet ports on the router/firewall machine.
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