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The RTT column of the Performance section of the PathPing output might identify a performance problem . This column shows round-trip time (RTT) in milliseconds, which is the two-way latency of communications with that particular device . Although all networks will show gradually increasing latency as the hop count increases, a large latency increase from one hop to the next identifies performance problems . Performance problems might also be evident from a high percentage shown in the Lost/Sent = Pct column . This column measures packet loss . Although packet loss in the single digits generally does not indicate a problem that would cause performance or connectivity problems, packet loss of greater than 30 percent generally indicates that the network node is experiencing problems .

later hops, the network device has been configured to not answer pathping queries, which does not necessarily indicate a problem.

If the last item shown in the first section of PathPing output resembles the following example, PathPing was unable to communicate directly to the destination .

14 * * *

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This might or might not indicate a possible connectivity problem, however . Although the device might be offline or unreachable, it is also likely that the destination or a network node in the path to the destination has been configured to drop the ICMP packets that PathPing uses to query devices . ICMP is disabled by default in many modern operating systems . Additionally, administrators often manually disable ICMP on other operating systems as a security measure to make it more difficult for malicious attackers to identify nodes on the network and to reduce the effects of some denial-of-service attacks .

Windows Firewall drops ICMp packets by default on public networks. Therefore,

You can use the Notmyfault utility from Windows Sysinternals (www.microsoft.com /technet/sysinternals) to generate the crashes described here. Notmyfault consists of an executable named Notmyfault.exe and a driver named Myfault.sys. When you run the Notmyfault executable, it loads the driver and presents the dialog box shown in Figure 14-8, which allows you to crash the system in various ways or to cause the driver to leak paged pool. The crash types offered represent the ones most commonly seen by Microsoft s product support services. Selecting an option and clicking the Do Bug button causes the executable to tell the driver, by using the DeviceIoControl Windows API, which type of bug to trigger. Note You should execute Notmyfault crashes on a test system or on a virtual machine because there is a small risk that memory it corrupts will be written to disk and result in file or disk corruption.

unless you connect to a domain controller or configure a network as private, Windows will not respond to ICMp requests by default.

If PathPing is unable to reach the destination, you should attempt to communicate directly with the application by using Telnet, as described in the section titled Telnet Client later in this chapter .

If the PathPing output indicates that PathPing was able to communicate successfully with the destination and the RTT time shown for the destination is less than 1,000 milliseconds, there are probably no name resolution or IP connectivity problems between the source and destination . However, PathPing will not show problems with a specific service or application . For example, PathPing might successfully communicate with a Web server even if the Web server services are stopped . For more information about troubleshooting application issues, see the section titled How to Troubleshoot Application Connectivity Problems later in this chapter .

You can use Performance Monitor, shown in Figure 31-2, to view thousands of real-time counters containing information about your computer or a remote computer . When troubleshooting network performance problems, you can use Performance Monitor to view current bandwidth utilization in a more detailed way than provided by Task Manager or Resource Monitor . Additionally, Performance Monitor provides access to counters measuring retries, errors, and much more .

Performance Monitor provides access to the following categories, which contain counters that might be useful for troubleshooting network problems:

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