traceroute problems

Wojciech Puchar wojtek at
Tue Mar 11 06:24:43 UTC 2008

> 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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