[c-nsp] Port Traceroute utility?

[Aaron Daubman]

Jonathan,

> This is going to sound weird, but I am looking for a utility that will
> let me tracroute on a specific port to see if and where a port is
> being blocked on a network...

Check out the man page for traceroute:
http://developer.apple.com/documentation/Darwin/Reference/Manpages/man8/traceroute.8.html

Depending on your OS/version, the flags may differ, however, in
general, you should be able to accomplish this using traceroute by:

1) setting firewall compatibility mode / dont-increment-port-number mode
2) Set the protocol to TCP or UDP as necessary (usually -P)
3) Set the port number to use (usually -p)

Good luck,
     Aaron