Hello all
Well straight to the point
I am having two network interface

1.) USB CDMA Modem(ppp0), connect to internet, assigned DHCP when ever connects
2.) Ethernet (eth0), IP address, Connected with LAN,

Using CentOS 5.2

Now what i am trying to do is, i want to access Internet on other computers using the same PPP connection and my linux box.
i am able to start ICS on windows machine but, i am having Linux box as server at my small setup, which will have connection to internet and internet routed through the linux box to other networked computers

so the view is
Internet <-- USB Modem ppp0 <-- (Linux as Router) <-- internal network on eth0

Hope i will get some answers and settings for IPTables

Thank You