Internet Connection Sharing
To enable Internet Connection Sharing on a network connection:
Open Network Connections.
Click the dial-up, local area network, PPPoE, or VPN connection you want to share.
Then, under Network Tasks,click Change settings of this connection.
On the Advanced tab, select the Allow other network users to connect through this computer's Internet connectioncheck box.
If you want this connection to dial automatically when another computer on your home or small office networkattempts to access external resources, select the Establish a dial-up connection whenever a computer on my networkattempts to access the Internet check box.
If you want other network users to enable or disable the shared Internet connection, select the Allow other networkusers to control or disable the shared Internet connection check box. Under Internet Connection Sharing, in Home networking connection, select any adapter that connects the computer sharing its Internet connection to the other computers on your network.