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Re: RE: Re: Anonymous access to Voice VLAN using CDP
From: lists () packetfocus com
Date: 26 Jul 2006 07:53:09 -0000

I don't this is top secret or proprietary to VoipShield.

This is from FishNet :)

"Cisco Systems uses CDP messages to identify IP Phones in order to give them access to the voice VLAN independently of 
data VLAN access by users or devices that have authenticated via 802.1x. A false sense of security in enterprises that 
use 802.1x port-level authentication and IP telephony together may be the result of this."

So yes.. Yersenia CDP generator should be used for something like this. OR if you really want to figure it out. Setup a 
hub/sniffer inline with a VOIP phone and see how it sends the CDP auth packet to join the Voice Vlan. Cain/Able would 
be good as well.

Check out the VOIP Section on my site: packetfocus.com for some open source tools.

Email me if you have problems.

Josh Perrymon

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