Enabling Internet Connection Sharing
To enable ICS, on your host computer:
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Open Network Connections by clicking the Start button , clicking Control Panel, clicking Network and Internet, clicking Network and Sharing Center, and then clicking Manage network connections.
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Right-click the connection that you want to share, and then click Properties. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
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Click the Sharing tab, and then select the Allow other network users to connect through this computer’s Internet connection check box.
Note
The Sharing tab will not be available if you don't have a wireless network connection and a wired LAN connection.
When you enable ICS, your local area network (LAN) connection gets a new static IP address and configuration, so you'll need to reestablish any TCP/IP connections between your host computer and the other network computers.
To test your network and Internet connection, see if your VoIP telephone has a usuable dial tone. If it does it is working.