I'm not totally sure, but I believe your looking for a tool like Netcat.

http://netcat.sourceforge.net/

-Outbound and inbound connections, TCP or UDP, to or from any ports.
-Built-in port-scanning capabilities, with randomizer.

Basically you need to setup Netcat like tracert/route and specify UDP/TCP
and the port.

Hope this helps

Philippe Rivest - CEH, Network+, Server+, A+
TransForce Inc.
Internal auditor - Information security
Verificateur interne - Securite de l'information

8585 Trans-Canada Highway, Suite 300
Saint-Laurent (Quebec) H4S 1Z6
Tel.: 514-331-4417
Fax: 514-856-7541

http://www.transforce.ca/

-----Message d'origine-----
De : listbounce (at) securityfocus (dot) com [email concealed] [mailto:listbounce (at) securityfocus (dot) com [email concealed]] De
la part de Phunkodelic
Envoyé : 5 novembre 2009 13:01
À : security-basics (at) securityfocus (dot) com [email concealed]
Objet : How do I find out what hop is not forwarding traffic on a specific
port?

Looking for a way to find out who or what device is blocking traffic
on a specific port. Sort of like a trace route tool where you could
designate the port to test with (UDP/TCP). I realize that UDP may be
hard to do since it is a connectionsless protocol.

Anybody? Thanks in advanced.

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