Paul Goyette wrote:
 
> The firewall is probably blocking most UDP ports;  traceroute uses
> UDP.  Ping works because ping uses ICMP ECHO messages....
 
Does it?.

I heard about traceroute implementations using ICMP ECHOs with
timetolive set from 1 up, and display the ``can't forward'' messages. 

Maybe that's just another implementation.

Alex.