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Cc: Zbigniew Szalbot <zszalbot@gmail.com>,
	freebsd-questions <freebsd-questions@freebsd.org>,
	Jonathan Chen <jonc@chen.org.nz>
Subject: Re: traceroute problems
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> 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.