How to set up a direct Wi-Fi connection in Windows XP? (page 5 of 6)

Internet Connection Sharing (ICS) setup

On the computer that is connected directly to the Internet. Do these steps to share an Internet connection. (You are assumed to have configured your Internet connection before. If not, use the New Connection Wizard then.)
1. Open Network Connections folder.
2. On the right pane, find the Internet connection that you want to share. Right-click on it and select Properties. While the most likely case is sharing a wireline broadband (DSL/cable) service, basically you can share any type of Internet connection (including PSTN dial-up, GPRS, 3G, FTTH, WiMAX, etc) using the same procedure.

If your broadband connection is using login (PPPoE) and you log in from Network Connections folder, you'll find the Internet connection under Broadband. If your broadband connection is always on, your Internet connection must be under LAN or High-Speed Internet. Find the Local Area Connection that corresponds with the Ethernet card which connects the host computer to the broadband modem. Rename it to a name that easily identifies your Internet connection. Follow the same procedure to enable ICS.

opening Internet connection properties window from Network Connections

Figure. Opening an Internet connection properties window from Network Connections
to create Internet connection sharing (ICS). Select the relevant Internet connection.

3. On the Advanced tab, check "Allow other network users to connect through this computer's Internet connection" and select "Wireless Network Connection" from the drop-down box. The drop-down box only appears if there are more than one network adapters installed in your computer.
If you don't find ICS options on Properties window, the most likely case is your Wi-Fi ad hoc network hasn't been connected. Try to reconfigure it.

Internet connection properties window

Figure. Configuring Internet Connection Sharing (ICS) for the Wi-Fi ad hoc network
via the Internet connection Properties window.

4. Click OK. You can verify whether your wireless LAN (ad hoc) and ICS have been working from the IP addresses of your Wi-Fi adapters. If the IP addresses are APIPA addresses in this format 169.254.x.y (where x and y are any integer from 0 to 254) with the same subnet (i.e., then your ad hoc network has been active. Browse your network configuration from My Network Places. If you have configured your personal firewall to allow file and printer sharing (which is the default setting in Windows Firewall), you will see both your computers in My Network Places>Microsoft Windows Network>your workgroup name.

Meanwhile, for the ICS to work your Wi-Fi network adapter on the ICS host computer (which connects directly to the broadband modem) must have been assigned this private gateway IP address and the ICS client (which will connect to the Internet via the ICS host) must have another IP address in this format 192.168.0.z where z is any integer from 2 to 254.

To have IP addresses assigned automatically by Windows, you just need to make sure that your Wi-Fi adapters are set to obtain IP address and DNS server address automatically (DHCP) which is the default configuration. To verify, right click your Wireless Network Connection, and select Properties. On the General tab, select Internet Protocol (TCP/IP) Properties.

Now you have finished the Wi-Fi ad-hoc network setup and enabled Internet connection sharing. To access another computer resources (i.e. files, folders, drives, printer, peripherals), you must enable sharing with other network users for each resource.

Wireless Network Connection status

Figure. Viewing details of a Wireless Network Connection via the status window
You can see among others: number of transferred packets, duration, signal strength, and IP address.

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