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.

many commercial firewalls, including those in integrated devices, tend to block everything excluding often used services. some even block ICMP ping.
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