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Chapter 3. Sharing a Connection > Using Internet Connection Sharing

Using Internet Connection Sharing

If you’re running Windows 98 Second Edition, Windows Me, Windows 2000, or Windows XP, Microsoft has provided you with built-in NAT software for sharing a broadband Internet connection. This software is called Internet Connection Sharing (ICS), and it enables a single gateway computer to manage a shared Internet connection for other multiple computers on a LAN.

Caution

Internet Connection Sharing was not included in the first edition of Windows 98, nor in Windows 95 or any previous versions of the Windows operating system.


With ICS, the gateway computer is called the host, and all the other computers on the network are called clients. The host computer and the clients have to be set up separately, as described in the following sections.

Note

The following instructions assume that you’ve already installed and configured network cards in each of your computers.


Setting Up the Host Computer

To install ICS on your lead computer, follow these steps:

1.
From the Windows Control Panel, launch the Add/Remove Programs applet and select the Windows Setup tab.

2.
In the Component list, highlight Internet Tools and click the Details button.

3.
When the Internet Tools dialog box appears, enter a checkmark next to Internet Connection Sharing and click OK.

Note

You may be asked to insert your Windows installation CD; if so, do.

4.
When the Internet Connection Sharing Wizard appears, as shown in Figure 3.5, click Next to advance to the next screen.

Figure 3.5. Use the Internet Connection Setup Wizard to set up Internet Connection Sharing on your gateway PC.


5.
When the next screen appears, choose the High-Speed Connection option and click Next. (If you’re sharing a dial-up connection, choose Dial-Up Connection instead.)

6.
When the next screen appears, select the network card that is connected to your broadband connection, then click Next.

Caution

Because you have two network cards installed on your gateway computer, it’s relatively easy to choose the wrong card at this step. If you get to the end of the process and find that the shared connection isn’t working, you probably picked the wrong card—so switch the cables connected to each card and everything should be fixed.

7.
The wizard will now ask you whether you want to create an Internet Connection Sharing Client Disk. Click Yes to do this.

8.
When the final screen appears, click Finish. Restart Windows when prompted.

After you’ve installed ICS on your gateway computer, you need to configure all your client computers to share the connection, as described next.

Setting Up the Client Computers

For each client computer on your shared connection, follow these steps:

1.
From the Windows Control Panel, launch the Network applet and select the Configuration tab.

2.
From the list of installed components, select the TCP/IP component for the installed network card (should read TCP/IP->nameofcardnameofcard>) and click the Properties button.

3.
When the TCP/IP Properties dialog box appears, select the IP Address tab and choose the Obtain an IP Address Automatically option.

4.
Still within the TCP/IP Properties dialog box, select the WINS Configuration tab and choose the Use DHCP for WINS Resolution option.

5.
Select the DNS Configuration tab and choose the Disable DNS option.

6.
Select the Gateway tab and remove any items in the Installed Gateways list.

7.
Click OK when done, and then OK again to close the Network window. Restart Windows when prompted.

Repeat these steps for each client computer (but not your gateway computer!) on your network.

Establishing the Connection

After you’ve restarted the last computer on your network, Internet Connection Sharing should be fully operational across all your PCs. As long as your gateway computer is connected to your broadband connection, all the other PCs should also have a live, always-on connection.

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