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Re: How do I find out what hop is not forwarding traffic on a specific port?
From: Ansgar Wiechers <bugtraq () planetcobalt net>
Date: Mon, 9 Nov 2009 19:41:57 +0100

On 2009-11-05 Phunkodelic wrote:
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.

On Unix-like systems use tcptraceroute for TCP and the normal traceroute
for UDP packets (option -p). On Windows you can use tracetcp [1] for TCP
packets, but I don't know a tool for tracing UDP packets (tracert does
not support this).

[1] http://tracetcp.sourceforge.net/

Ansgar Wiechers
"All vulnerabilities deserve a public fear period prior to patches
becoming available."
--Jason Coombs on Bugtraq

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