Using traceroute to Isolate the Problem to Two Routers

One of the best features of the traceroute command, as compared to ping, is that when it does not complete it gives an immediate clue as to where to look next. With ping, when the ping fails, the next step is usually to use more ping commands. With traceroute, it tells you what router to try and connect and look at the routes and in which direction.

Note

As a reminder, this book uses the term forward route for routes that send the packets sent by the ping or traceroute command, and reverse route for the packets sent back.

When a problem exists, a traceroute command results in a partial list of routers. Then the command either finishes with an incomplete list or it runs until the user must ...

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