How to set a 2nd NIC on a 2008 server to broadcast internet connectivity?

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http://serverfault.com – Hye , I download ms forefront , I want to set it as edge connectivity. So 1st nic is public ip and, 2nd nic is for my internal network. now i have configured 1st public nic with the proper ip and gateway, and its connecting. Now i have set the 2nd nic with an ip and a subnet only but nothing. It's not connecting. I know i should tackle something in routing table but i dont know what it is. Any help is greatly appreciated. Thanks. (HowTos)