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Monitoring and Troubleshooting TCP/IP Connections
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Figure 3-8 Output of Ipconfig /all
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Network Diagnostics
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Network Diagnostics is a graphical troubleshooting tool, built into the Windows Server 2003 interface, that provides detailed information about the local computer s network ing configuration. To access the tool, first launch Help And Support from the Start menu. From the Help And Support Center window, click Tools in the Support Tasks area. Finally, expand Help And Support Center Tools from the Tools list, and then select Network Diagnostics. The Network Diagnostics window appears in the right pane of Help And Support Center, as shown in Figure 3-9.
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Figure 3-9 Network Diagnostics
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Troubleshooting TCP/IP Connections
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When you click Scan Your System, Network Diagnostics runs a series of tests that gath ers information about the local computer s environment, as shown in Figure 3-10.
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Figure 3-10
Network Diagnostics gathering network data
Information gathered is reported in a series of categories. Each category contains con densed trees of data that you can expand by clicking the associated plus symbol. By default, Network Diagnostics collects information about only three categories: the Internet Service category, which includes information about Microsoft Outlook Express Mail, Microsoft Outlook Express News, and Internet Explorer Web Proxy configuration; the Computer Information category, which includes Registry parameter settings for the computer system, operating system, and operating system version; and the Modems And Network Adapters category, which includes Registry parameter settings for modems, network adapters, and network clients. However, by clicking the Set Scanning Options button in the Network Diagnostics win dow, you can add and remove categories of data to be collected. You can also alter the diagnostic actions performed for each category, as shown in Figure 3-11.
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Monitoring and Troubleshooting TCP/IP Connections
Figure 3-11
Network Diagnostics options
Real World
Using the Save To File Feature
In general, diagnosing and troubleshooting client computers from over the network is more efficient than doing so locally. But this task is not always possible sometimes the network problem experienced at the client computer precludes establishing a connection across which to run diagnostic tools. When the problem is both serious and remote such as when an employee in your organization calls you from a different city and requests assistance in connecting to the network you typically have to talk the employee through elaborate procedures to gather enough information to solve the problem. The Network Diagnostics tool includes the Save To File feature, which gives you another way to help diagnose remote clients to which you cannot connect directly. Instead of talking users through Ipconfig, Ping, and other utilities run from the command prompt, you can simply have them run the Network Diagnos tics tool from the graphical user interface (GUI), save the file to a floppy disk, and then e-mail you the file from another computer.
Netdiag
Netdiag is a command-line utility that you must install manually from the Windows Server 2003 installation CD. The utility is included in the group of tools called the Win dows Support Tools. You can install this group of tools by browsing the CD to the \Support\Tools folder and double-clicking Suptools.msi. After the setup program is complete, you can run Netdiag from the installation directory you selected during the setup process.
Lesson 2
Troubleshooting TCP/IP Connections
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Like Network Diagnostics, Netdiag runs a series of tests on the local computer and then displays the results of those tests. To troubleshoot network problems, scan the Netdiag output for error messages. Table 3-3 shows a small selection of the default tests run by Netdiag.
Table 3-3
Netdiag Tests
Details Lists the network adapter configuration details, including the adapter name, IP address, and default gateway. If this test shows an unrespon sive network adapter, the remaining tests are aborted. Checks to confirm details of the primary domain, including computer role, domain name, and domain GUID. Checks to see whether Netlogon service is started, adds the primary domain to the domain list, and que ries the primary domain security identifier (SID). Checks that the workstation service name <00> is equal to the computer name. Also checks that the messenger service name <03> and server ser vice name <20> are present on all interfaces and that none of these names are in conflict. Similar to the nbtstat n command. Sends NetBT name queries to all the configured WINS servers. Checks whether DNS cache service is running, and whether this com puter is correctly registered on the configured DNS servers. If the com puter is a domain controller (DC), DNS test checks whether all the DNS entries in Netlogon.dns are registered on the DNS server. If the entries are incorrect and the /fix option is on, try to re-register the domain controller record on a DNS server. Lists all bindings, including interface name, lower module name, upper module name, whether the binding is currently enabled, and the owner of the binding. Displays the settings and status of current active remote access connec tions. Tests whether IP security is enabled and displays a list of active Internet Protocol Security (IPSec) policies.
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