many commercial firewalls, including those in integrated devices, tend to
block everything excluding often used services. some even block ICMP ping.
to prevent you from learning about their routing paths. In these cases,
you get back the "1 * * *" type of output from traceroute. Also, by
default traceroute attempts to do a reverse DNS on the IP address, so
you can speed things up by doing a 'traceroute -n' to avoid this look-up.
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