The traceroute utility displays the route used by IP packets on their way to a
specified network (or Internet) host. Traceroute displays the IP number and
host name (if possible) of the machines along the route taken by the packets.
Traceroute is used as a network debugging tool. If you're having network
connectivity problems, traceroute will show you where the trouble is coming
from along the route.
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Install traceroute if you need a tool for diagnosing network connectivity
problems.