The following instructions are for Windows XP; Vista and Windows 7 instructions are similar, detailed under How to Share Internet Connection on Vista or on Windows 7. You can also Share Your Mac's Wired Internet Connection via Wi-Fi. If you have a wireless Internet connection that you want to share with other devices, you can Share Your Wi-Fi Internet Connection on Windows 7 using Connectify.
- Log on to the Windows host computer (the one connected to the Internet) as an Administrator
- Go to Network Connections in your Control Panel by going to Start > Control Panel > Network and Internet Connections > Network Connections.
- Right-click your Internet connection that you want to share (e.g., Local Area Connection) and click Properties.
- Click the Advanced tab.
- Under Internet Connection Sharing, check "Allow other network users to connect through this computer's Internet connection"
- Optional: A lot of people don't use dial-up anymore, but if that's how you connect to the Internet, select the "Establish a dial-up connection whenever a computer on my network attempts to access the Internet" checkbox.
- Click OK and you will receive a message about your LAN adapter being set to 192.168.0.1.
- Click Yes to confirm you want to enable Internet Connection Sharing.
- Your Internet connection will now be shared to other computers on your local network; if you connect them via wire (either directly or through a wireless hub), you're all set.
- If you want to connect the other devices wirelessly, however, you'll need to Set Up an Ad Hoc Wireless Network or use newer Wi-Fi Direct technology.
- Clients that connect to the host computer should have their network adapters set to get their IP address automatically (look in the network adapter properties, under TCP/IPv4 or TCP/IPv6 and click "Obtain an IP address automatically")
- If you create a VPN connection from your host computer to a corporate network, all of the computers on your local network would be able to access the corporate network if you use ICS.
- If you share your Internet connection over an ad hoc network, ICS will be disabled if you disconnect from the ad hoc network, create a new ad hoc network, or log off from the host computer.
What You Need
- a Windows XP computer with Internet connection and another network adapter
- client computers that are TCP-IP enabled and capable of an Internet connection
- network adapter for each computer
- modem for the entire network