To use Internet Connection Sharing to share your Internet connection, the host computer must have one network adapter that is configured to connect to the internal network, and one network adapter or modem that is configured to connect to the Internet.
On the host computer or Main Computer, follow these steps to share the Internet connection:
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Click Start Menu, and then click Control Panel.
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Click Network Connections.
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Right-click the connection that you use to connect to the Internet. For example, if you connect to the Internet by using a modem, right-click the connection, then Properties
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Click the Advanced tab.
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Under Internet Connection Sharing, select the Allow other network users to connect through this computer's Internet connection check box.
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If you are sharing a dial-up Internet connection, select the Establish a dial-up connection whenever a computer on my network attempts to access the Internet check box if you want to permit your computer to automatically connect to the Internet.
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Click OK. Then you receive the following message:
When Internet Connection Sharing is enabled, your LAN adapter will be set to use IP
address 192.168.0.1. Your computer may lose connectivity with other computers on
your network. If these other computers have static IP addresses, it is a good idea to set them
to obtain their IP addresses automatically. Are you sure you want to enable Internet
Connection Sharing?
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Click Yes.
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The connection to the Internet is shared to other computers on the local area network (LAN). The network adapter that is connected to the LAN is configured with a static IP address of 192.168.0.1 and a subnet mask of 255.255.255.0
