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RE: How do I find out what hop is not forwarding traffic on a specific port?
From: "Rivest, Philippe" <PRivest () transforce ca>
Date: Mon, 9 Nov 2009 13:22:25 -0500

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


-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


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

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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