Definition: traceroute

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Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

traceroute

   A (typically Unix) TCP/IP utility which allows the user to
   determine the route packets are taking to a particular
   host.  Traceroute works by increasing the "time to live"
   value of packets and seeing how far they get, until they reach
   the given destination; thus, a lengthening trail of hosts
   passed through is built up.