With Internet Connection Sharing (ICS) in Windows                              XP, you can connect one computer to the Internet,                              then share the Internet service with several computers                              on your home or small office network. The Network                              Setup Wizard in Windows XP Professional will automatically                              provide all of the network settings you need to share                              one Internet connection with all the computers in                              your network. Each computer can use programs such                              as Internet Explorer and Outlook Express as if they                              were directly connected to the Internet.
                            You should not use this feature in an existing network                              with Windows 2000 Server domain controllers, DNS servers,                              gateways, DHCP servers, or systems configured for                              static IP addresses.
                            
                            Enabling ICS
                           
                            The ICS host computer needs two network connections.                              The local area network connection, automatically created                              by installing a network adapter, connects to the computers                              on your home or small office network. The other connection,                              using a 56k modem, ISDN, DSL, or cable modem, connects                              the home or small office network to the Internet.                              You need to ensure that ICS is enabled on the connection                              that has the Internet connection. By doing this, the                              shared connection can connect your home or small office                              network to the Internet, and users outside your network                              are not at risk of receiving inappropriate addresses                              from your network.
                            When you enable ICS, the local area network connection                              to the home or small office network is given a new                              static IP address and configuration. Consequently,                              TCP/IP connections established between any home or                              small office computer and the ICS host computer at                              the time of enabling ICS are lost and need to be reestablished.                              For example, if Internet Explorer is connecting to                              a Web site when Internet Connection Sharing is enabled,                              refresh the browser to reestablish the connection.                              You must configure client machines on your home or                              small office network so TCP/IP on the local area connection                              obtains an IP address automatically. Home or small                              office network users must also configure Internet                              options for Internet Connection Sharing. To enable                              Internet Connection Sharing (ICS) Discovery and Control                              on Windows 98, Windows 98 Second Edition, and Windows                              Millennium Edition computers, run the Network Setup                              Wizard from the CD or floppy disk on these computers.                              For ICS Discovery and Control to work on Windows 98,                              Windows 98 Second Edition, and Windows Millennium                              Edition computers, Internet Explorer version 5.0 or                              later must be installed.
                            
                            To enable Internet Connection Sharing on a network                              connection 
                           
                            You must be logged on to your computer with an owner                              account in order to complete this procedure.
                            Open Network Connections. (Click Start, click Control                              Panel, and then double–click Network Connections.)                              
                           Click                              the dial–up, local area network, PPPoE, or VPN connection                              you want to share, and then, under Network Tasks,                              click Change settings of this connection. 
                           On                              the Advanced tab, select the Allow other network users                              to connect through this computer's Internet connection                              check box.
                            If you want this connection to dial automatically                              when another computer on your home or small office                              network attempts to access external resources, select                              the Establish a dial–up connection whenever a computer                              on my network attempts to access the Internet check                              box. 
                           If                              you want other network users to enable or disable                              the shared Internet connection, select the Allow other                              network users to control or disable the shared Internet                              connection check box. 
                           Under                              Internet Connection Sharing, in Home networking connection,                              select any adapter that connects the computer sharing                              its Internet connection to the other computers on                              your network. The Home networking connection is only                              present when two or more network adapters are installed                              on the computer. 
                            
                            To configure Internet options on your client computers                              for Internet Connection Sharing
                           
                            Open Internet Explorer. Click Start, point to All                              Programs, and then click Internet Explorer.) 
                           On                              the Tools menu, click Internet Options. 
                           On                              the Connections tab, click Never dial a connection,                              and then click LAN Settings.
                           
                            In Automatic configuration, clear the Automatically                              detect settings and Use automatic configuration script                              check boxes. 
                           In                              Proxy Server, clear the Use a proxy server check box.