Sharing of Internet Connection in Redhat Linux

Hi there,
In Windows OS, Internet connection can be shared to other LAN or Wireless LAN. I am using Redhat Linux 6 and I have two LAN card in my PC. How can I share Internet connection from one LAN card to another LAN card in Linux? Please, provide me the solution ASAP. This is mandatory for me to share the Internet connection.
Thank You.


