Here is what I’ve done for connection sharing. I do agree that this one is not the best but can give u an idea for an ideal setup.
I assume that u have 2 ethernet cards. In my case I have an inbuilt NIC which is connected to adsl modem. The second card is the addon NIC to interconnect the network.
Open control panel -> network connections. u should have something like this.
Right click the inbuilt lan connection or the one connected to the adsl modem and select properties. Make sure ppp over Ethernet is selected while others unselected.
Right click the other lan connection, select properties and configure it to look like this.
Configure local IP address for this lan if not done.
Now run a proxy server. Any proxy will do, no configuration is necessary for basic usage. Look for free proxy in april 2k5 digit cd/dvd.
No go to the system that require net access and configure ur browser settings something similar to this.
Done.
for a complete setup please do refer this link
http://www.windowsnetworking.com/pag...le_p.asp?id=26