From: lists@packetfocus.com
Date: Wed Jul 26 2006 - 03:53:09 EDT
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
CEO
Packetfocus.com
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