First, you have to have a Win2k system on a private network connected to other systems that use DHCP (Dynamic Host Configuration Protocol) to retrieve an IP address. You should not enable Connection Sharing on corporate networks because you could cause serious connectivity problems for others on your network. It may even become a security vulnerability. However, if you want to share an Internet connection between multiple computers at home, this mechanism suits you perfect.
Log into your Win2k system as an administrator. Click the Start button, navigate to Settings and select Network and Dial-Up Connections. You will see a list of all the dial-up connections you have configured. Right-click on the one you will use when sharing an Internet connection, and select Properties.
From the Dial-Up Connection Properties dialog box, select the Sharing tab. Select the Enable Internet Connection Sharing For This Connection checkbox. If you have more than one network card, select the Local Area Connection that matches the network other computers will connect through. Click OK and you will be warned that your LAN IP address will be changed to 192.168.0.1. Click Yes.
Your computer will also be configured to hand out IP addresses on this logical network to other systems using DHCP. So, you will need to log onto every other system and change the IP address settings to use DHCP. Wait a few minutes and every system should retrieve an IP address in the 192.168.0.x network and have access through the dial-up connection when you are connected.
There are certainly more robust ways to share connection-dedicated hardware devices and software packages like Microsoft's Internet Security and Acceleration Server. However, this functionality built-in to Win2k will probably suit your needs. If you have any problems, please let me know.
This was first published in June 2001