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Troubleshooting with Tracert
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Tracert is a route-tracing utility that allows you to track the path of a forwarded packet from router to router for up to 30 hops. Tracert works by sending ICMP echo requests to an IP address, while incrementing the Time to Live (TTL) field in the IP header, start ing at 1, and analyzing the ICMP errors that are returned. Tracert prints out an ordered list of the routers in the path that returned these error messages. In the following exam ple, Tracert is used to trace the path from the local computer to a remote computer named www.contoso.com:
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C:\>tracert www.contoso.com
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Tracing route to www.contoso.com [10.102.252.1]
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over a maximum of 30 hops:
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1 300 ms 281 ms 280 ms roto.contoso.com [10.181.164.100]
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2 300 ms 301 ms 310 ms sl-stk-1-S12-T1.contoso.com [10.228.192.65]
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3 300 ms 311 ms 320 ms sl-stk-5-F0/0.contoso.com [10.228.40.5]
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4 380 ms 311 ms 340 ms icm-fix-w-H2/0-T3.contoso.com [10.228.10.22]
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5 310 ms 301 ms 320 ms arc-nas-gw.arc.contoso.com [10.203.230.3]
6 300 ms 321 ms 320 ms n254-ed-cisco7010.contoso.com [10.102.64.254]
7 360 ms 361 ms 371 ms www.contoso.com [10.102.252.1]
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3
Monitoring and Troubleshooting TCP/IP Connections
Exam Tip
You need to know the difference between Tracert and PathPing on the exam. Use Tracert to quickly determine where a break occurs in the path of connectivity to a remote loca tion. PathPing is more useful when you have connectivity to a site but are experiencing erratic packet loss or high delay. In these cases, PathPing tells you exactly where packet loss is occurring.
Troubleshooting Using the ARP Tool
Network traffic sometimes fails because a router s proxy ARP request returns the wrong address. If you can ping both the loopback address and your own IP address, but you cannot ping a computer on the local subnet, the next step is to check the ARP cache for errors. The ARP command is useful for viewing the ARP cache. If two hosts on the same subnet cannot ping each other successfully, try running the ARP command with the a switch on each computer to see whether the computers have the correct MAC addresses listed for each other. To determine a host s MAC address, you can use the Ipconfig /all command or the Getmac command. Then use the ARP command with the -d switch to delete any entry that might be incorrect. Add entries by using ARP with the s switch. If you cannot ping a computer on a local subnet by IP address, and the ARP a com mand reveals no errors in hardware address mappings, you should investigate for errors in the physical media, such as LAN cards, hubs, and cables.
Practice: Running Network Diagnostics and Netdiag
In this practice, you run both Network Diagnostics and the Netdiag utility. You then save the output of these tests to files.
Exercise 1: Running Network Diagnostics
In this exercise, you save the output from the Network Diagnostics tool to an HTML file. 1. Log on to Computer1 as Administrator. 2. Click Start, and then click Help And Support. The Help And Support Center window opens. 3. Under the Support Tasks list on the right side of the Help And Support Center win dow, click Tools.
Lesson 2
Troubleshooting TCP/IP Connections
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4. In the Tools list on the left side of the Help And Support Center window, expand Help And Support Center Tools, and then click Network Diagnostics. The Network Diagnostics tool appears on the right side of the Help And Support Center window. 5. Click the Scan Your System button. Information loads for a few seconds, and then three headings of status information are displayed: Internet Service, Computer Information, and Modems And Network Adapters. 6. Expand all of the categories by clicking the plus symbols under them. All of the information trees under each heading expand, revealing the full results of the tests just run. 7. Take a few moments to browse the information available in the expanded trees. 8. In the Network Diagnostics window, click the Set Scanning Options button. Below the Options heading, the Actions area and the Categories area are shown. 9. Under the Actions area, select the Verbose check box. 10. In the Categories area, clear the following check boxes: Mail Service, News Service, Internet Proxy Server, Computer Information, Operating System, and Windows Version. Only Modems, Network Clients, and Adapters should now be selected. 11. In the Network Diagnostics window, click the Scan Your System button to begin gathering information. When the tests have completed, the Network Diagnostics window reveals three sets of information under a single heading: Modems And Network Adapters. 12. In the Network Diagnostics window, click the Save To File button to save to a file the results of the test just run. A message indicates that the file just created has been saved to the desktop and to another specified location. 13. Click OK to close the message. 14. Next to the Save To File button in the Network Diagnostics window, click Show Saved Files. A folder opens revealing one location of the new file. 15. On the Windows Quick Launch toolbar, click Show Desktop. Another copy of the Hypertext Markup Language (HTML) file created by Network Diagnostics is visible on the desktop.
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