0 TCP IP STEP NO 9

Secondary WINS server box. We want Windows NT to use DNS to look up TCP/IP host names and addresses, so select the checkbox beside Enable DNS for Windows Resolution. By default, the Enable LMHOSTS Lookup checkbox is selected. In this example installation, we want to rely only on DNS for lookups, so clear this box. LMHOSTS Lookup is a method of name resolution that uses a text file similar to DNS tables. However, it differs from DNS in that it maps IP addresses to NetBIOS computer names, similar to the WINS server, except that the table must be updated manually.

All computers on a TCP/IP network must use the same scope ID. Ask your network administrator whether a scope is defined for your network and type the scope ID in this field. If you don’t have a scope on your network, simply leave this field blank. Most Windows NT networks don’t use a Scope ID.

Next, click the DHCP Relay. DHCP lets workstations and servers be assigned IP addresses automatically. The primary reason for using DHCP is that it can provide a centralized method of managing IP addresses. We won’t delve into all the details of DHCP in this book, and for example purposes, we’ll assume that you are not using a DHCP server on your network, so no changes are necessary.

Now click the Routing tab to display the routing properties The Routing dialog box has a single checkbox labeled Enable IP Forwarding. IP forwarding allows datagrams to be forwarded on a multihomed host. A multihomed host has more than one network card installed or more than one IP address assigned to a network card. With multihomed hosts, sometimes datagrams need to be routed between the network cards to other parts or segments of the network. This setting is a key factor in establishing a secure network segment and is covered later in this book. For now, do not select the check box.

Now that you’ve completed configuring the TCP/IP properties, click OK to finish the setup process. The Binding Review is completed, and a dialog box asking whether you want to reboot now appears. It is always best to reboot whenever Windows NT asks you, so click Yes. Windows NT will write your settings to the registry and reboot. The registry can be viewed and modified with Regedt32.exe, which we cover later in this book.

After the server has rebooted, you can log on and test the configuration using the Ping utility. Open a DOS console window by clicking Start, selecting Programs, and choosing MS-DOS. When the DOS window opens, type the following command: ping 127.0.0.1. You should see a response similar to the one shown in
Ping sends a diagnostic packet to the address specified and waits for a response for a predetermined amount of time. We use the address 127.0.0.1 in this instance because it is a special loopback address designed for testing. If Ping does not receive a response in the predetermined amount of time, a time-out error is reported, as shown in
After you have pinged the localhost address, you should try to ping another host on your network to make sure everything is working correctly. For example, if you have another host on your network with the IP address 207.91.166.199, you can ping that address, as shown . You may also want to test your DNS or WINS setup at this time as well. You can