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If you are using DNS, be sure that you have checked the DNS tab of the Advanced TCP/IP Settings dialog box to confirm that the IP addresses of the DNS servers are correct and in the proper order. Use Ping with the remote computer s host name, and then use its IP address to determine whether the host address is being resolved properly. If the host name ping fails and the IP address ping succeeds, the problem is with name resolution. To check DNS configuration 1. In Control Panel, select Network and Internet Connections. 2. In the Network and Internet Connections sheet, select Network Connections. 3. In Network Connections, right-click the local area connection that you want to change and then click Properties.

Part IV:

Figure 3-6. The condition of the network connection and any appropriate error messages appear in the Network Connections window.

4. Click Internet Protocol (TCP/IP), and then click Properties. 5. In the Microsoft TCP/IP Properties sheet, click the Advanced tab. 6. Click the DNS tab. 7. Confirm that DNS is configured properly. If you find that the IP address of a particular DNS server is missing, be sure to add it to the list of DNS server addresses. Note This procedure does not apply to network connections configured by DHCP servers, as DHCP servers configure network connections with preferred and alternate DNS servers.

You can test whether the DNS servers are running by pinging their IP addresses or by opening a Telnet session to port 53 on the DNS server. If the connection is established successfully, the DNS service is working on the DNS server. After you have verified that the DNS service is running, you can perform Nslookup queries to the DNS server to further verify the status of the DNS records for which you are looking. For more information about Nslookup and other aspects of DNS configuration, see Windows 2000 DNS in the TCP/IP Core Networking Guide of the Microsoft Windows 2000 Server Resource Kit. If both pinging by IP address and pinging by name fail, the problem is with the network connection, possibly physical connectivity or routing. For more information about troubleshooting network connectivity, see Configuring TCP/IP on the companion CD. For more information about how DNS resolves host names, see Configuring DNS to Resolve Host Names and Domain Names earlier in this chapter.

Simple text (also called ASCII characters) is the usual output of a console application, but some console applications use ASCII graphic characters. (ASCII stands for American Standard Code for Information Interchange.) An ASCII code is the numerical representation of a character (such as 0 or #) or an action of some sort. Pressing Enter in a word processor to move a line of text is an action represented by an ASCII character, for instance. The ASCII graphic character set, also called extended ASCII characters, includes vertical lines, vertical double lines, corners, and much more. ASCII characters are sometimes used to create boxes around text in console applications. Unicode characters are similar to ASCII but are not encoded in the same way. They are more extensive and can represent different locales.

You can manage the network connection as well as the NIC from this location. The connection should rarely need your attention, but there is valuable information you can gain from the Network Connections window that can help you troubleshoot problems should any occur.

Errors in name resolution can occur when the entries in a DNS server or client are not configured correctly, when the DNS server is not running, or when there is a problem with network connectivity. To determine the cause of any name resolution problem, you can use the nslookup command-line tool. Failed queries return a variety of messages, depending on whether the name cannot be resolved, the server does not provide a response, or the request times out. These messages generally indicate one of the following:

The server is offline. The host computer does not have the DNS client service enabled. There is a hardware or routing problem.

If host name resolution is successful, the problem must be something else. The solution might simply be a matter of correcting the IP configuration.

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