Help setting up Linux internet connection sharing

[HamsterX]

I need help setting up NAT internet connection sharing in my Linux Red Hat 7.2. I know how to do it in Windows, but not in Linux.

I guess I should use ipchains/iptables, right ? But I have no idea how to setup these... most info I found in the net is too incomplete or outdated.

My two network cards are already configured and working fine, one of them connected to cable DHCP, the other with a static IP, just waiting for the clients to connect.

Thanks in advance

HamsterX