The standard UNIX traceroute command is probably the most basic tool available for fault detection and diagnosis in the Internet today. The utility also has spawned several enhancements, such as prtraceroute from the PRIDE project and the more advanced traceroute that comes with Linux. Cisco IOS Software, of course, has its own traceroute command, using the routing table in the router to provide detailed information. The source for traceroute can be found at ftp://ftp.ripe.net/tools/traceroute.tar.Z.
For those without access to any of these, or if you require a traceroute from another part of the Internet, an excellent public traceroute facility is located at http://www.traceroute.org, a catalog of traceroute "looking glasses" around the world.
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