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Chapter 9.  Using and Troubleshooting TC... > Can't connect to certain sites on th...

9.7. Can't connect to certain sites on the Internet

The ability to connect to some sites but not to others generally indicates a problem on the Internet backbone, heavily trafficked sites, or simply a site that is down for some reason. However, local factors could prevent you from reaching certain sites. The first step is to try to determine where the problem is occurring.

9.7.1. Trace the route to determine the point of failure

You can use the tracert command to test connectivity to a remote site. tracert sends out test packets with steadily incrementing time-to-live (ttl) values. Each gateway decrements the ttl value by 1. When the packet's ttl reaches zero, the remote router returns an ICMP Time Exceeded packet back to your computer. Subsequent packets make it one hop further before being timed out. The result is a table showing each hop. When the packets stop returning, you've identified the router where the problem exists.


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