Iinternet Connection Sharing in Linux8.0

I want to Share the Internet Connection Between Linux8.0 and Windows 98/2000. Modem was Configured on Linux machine.
These machines are in the network. I have Configured & Started the Samba, NFS, SQUID servives, but Internet connection still internet connection not shared.

How can I share this Internet Connection On the Network? Is there any services that I missed to Start? Or Any Othe Changes make in the configaration?