If all the physical connections seem to be working, restart the computer. As it boots,

Appendix B ✦ IP Addressing You install TCPIP to use with the dial-up networking feature. This installation enables you to connect to the Internet by means of a modem. The TCPIP communicates with Web servers on the Internet. If you install TCPIP on your network, you use it to connect to the other com- puters on your LAN. One installation has nothing to do with the other. For more information, see the section “Installing and Configuring TCPIP” later in this appendix. Using TCPIP to connect to the Internet provides you with all the Internet features and advan- tages, including e-mail, Web browsers, and file transfer. Also, TCPIP includes various pro- grams which are also protocols that you can use to access information on the Internet. If you have special needs for FTP or Telnet, for example, TCPIP provides those programs for you to use. If you plan to expand your network to the Internet someday, your knowledge and use of TCPIP will help you tremendously. Knowing how to configure TCPIP will make it easier for you to transfer your Web sites and pages to the Web and to configure clients and servers for the Internet. Having TCPIP in place means less configuring when you move to the Internet. Dial-Up Networking You also can use TCPIP to connect to your home or work computer. If you’re on the road, for example, and want to call your home network to retrieve some information or your schedule, you can use Windows dial-up networking to accomplish this. You use TCPIP in Terminal Services as well. Terminal Services is a method of communication between a remote computer and a server using Windows 2000 Server. For more information, see Appendix C. If your work network uses TCPIP, you can call in to that network from home or while you’re on the road. Additionally, if your office network includes DHCP server, calling from a remote computer becomes even easier. The DHCP server configures your computer so that all you need to do is dial and connect. Creating your own TCPIP network When setting up your own TCPIP network, you need to choose IP addresses for your com- puters. Remember, each computer on the network needs a unique IP address. You also need to set a specific subnet mask for your network to use. Several IP addresses are reserved for private use. Following are the three blocks reserved for IP addresses: 10.0.0.0 to 10.255.255.255 172.16.0.0 to 172.31.255.255 192.168.0.0 to 192.168.255.255 For your home network, for example, you could use the following IP addresses for five com- puters on the network: 172.16.0.1 172.16.0.2 172.16.0.3 172.16.0.4 172.16.0.5 Note Appendixes Alternatively, you could use the following for your computers: 192.168.0.100 192.168.0.101 192.168.0.102 192.168.0.103 192.168.0.104 You can change numbers only in the last octet of the IP address for a home network or small- business network. If your corporate network is very large, you can make other changes to the IP addresses, as long as they are consistent. In addition to IP addresses, you need a subnet mask. Use the same subnet mask for all com- puters on the network. The subnet mask 255.255.255.0 works very well. Using Windows 98 LinkLocal Windows 98 includes another method of configuring a TCPIP network called LinkLocal. LinkLocal creates automatic private IP addressing. You can use LinkLocal if you have a network that doesn’t use a DHCP server and if your computer is not a host computer on the Internet. With LinkLocal, your Windows 98 computer can assign itself a private IP address without your intervention. LinkLocal IP addresses always begin with 169.254. Windows fills in the other two octets for you. LinkLocal uses a block, or range, of IP addresses, from which it assigns the addresses of computers on your network. Using LinkLocal makes administering the network much easier than filling in the TCPIP information yourself. Following are some rules and guidelines for using LinkLocal: ✦ LinkLocal does not work on your network unless all the computers are running Windows 98. ✦ If your computer is a desktop or tower, it can assign itself an automatic private IP address when it starts up — as long as no DHCP server is found and the computer does not have a valid DHCP lease. ✦ If you connect to a DHCP server later, the DHCP server-assigned IP address takes prece- dence over the automatic private IP address. ✦ If the computer is a laptop, it can assign itself an automatic private IP address as long as no DHCP server is present on the network. ✦ If your computer is using a DHCP service and that service fails for some reason, the computer assigns itself an automatic private IP address to use until the DHCP service is back up and working. It then surrenders the IP address to the DHCP server. To enable LinkLocal, follow these steps: 1. Choose Start ➪ Settings ➪ Control Panel. The Control Panel window appears. 2. Double-click the Network icon. The Network dialog box appears, as shown in Figure B-1.

3. Select the TCPIP Ethernet adapter and click the Properties button. The TCPIP Properties

dialog box appears. For information about installing protocols, see Chapter 10.

4. In the IP Address tab of the TCPIP Properties dialog box, select the Obtain an IP

Address Automatically option, as shown in Figure B-2. Appendix B ✦ IP Addressing Figure B-1: Set the LAN TCPIP in the Network dialog box. 5. Click OK to close the TCPIP Properties dialog box. 6. Click OK again to close the Network dialog box. Windows prompts you to restart the computer. When you start the computer again, it automatically assigns itself an IP address. You must repeat these steps with each computer on the network to complete the process. When you’re finished, your network will be up and running using the TCPIP protocol. Figure B-2: Set the option to automatic IP addressing. Appendixes Installing and Configuring TCPIP You can install TCPIP on your Windows computer without adding any other software or hardware. Windows 98, 2000, and XP come with Microsoft’s TCPIP protocol suite built in; all you need to do is configure it. It’s important to note that you can install TCPIP for two differ- ent purposes — LAN use or dial-up use. For LAN use, install TCPIP on the Network dialog box and bind that protocol to a network interface card, or adapter. Binding assigns the protocol to the device so that they can work together for communications over the network. For Internet or remote access use, install TCPIP through the Dial-Up Networking window. You install the protocol on a specific connection. See Chapter 10 for more information about using TCPIP on the LAN. See Appendix C for information about using TCPIP for remote access. If you want to use TCPIP to connect to the Internet, see Chapter 16 for more information. Using TCPIP with Windows 98 When you install TCPIP on a computer on the LAN, you enable it to communicate with other computers that use the same protocol. You must install TCPIP on each computer on the net- work, use a unique IP address for each computer, and use the same subnet mask for each computer you configure. You do not use this method of installation if you used LinkLocal to activate automatic private IP addressing. You already may have installed a network client and adapter. If not, you can install those at this time. See Chapter 9 for more information. Note Cross- Reference Web Servers and TCPIP Addressing Using private IP addresses doesn’t affect your use of the Internet. You still can attach to the Internet by using your dial-up networking TCPIP. You can add a Web page to your ISP’s Web server, if you want. Your LAN IP addresses are separate from your Internet connection. Adding a Web server to your network, however, might complicate matters a bit. A Web server is a computer you attach to the Web so that you can display your own Web site. Generally, you install a special operating system such as NT Server and a Web server application such as Internet Information Server on the computer. You also should install a proxy server or firewall to keep Internet users from accessing your LAN through the server. Proxy servers and fire- walls keep people from hacking into your LAN; they can also keep your LAN users from access- ing certain Internet sites. To attach your Web server to the Internet, you need an IP address and a domain name. That IP address applies only to your Web server, not to the rest of your network. You can keep your orig- inal IP addresses for your LAN, as long as you use a firewall or proxy server to separate them from the Web server and none of the computers using a private IP address try to get onto the Internet.