I have 2 computers. Computer no 1 is connected to my D-Link ADSL modem. I have no hardware ADSL router/firewall. I want to surf on both the computer that is connected to the modem and my other computer. I want to install an extra network card in my "main" pc ad connect it to my second pc's network card. Need help setup all this. My connection to Internet through the main pc works nice.