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CDP Stocking Stuffer (by Tony Fortunato)

Tony_fortunatoThe_tech_firmAuthor Profile - Tony Fortunato is a Senior Network Specialist with experience in design, implementation, and troubleshooting of LAN/WAN/Wireless networks, desktops and servers since 1989. His background in financial networks includes design and implementation of trading floor networks. Tony has taught at local high schools, Colleges/Universities, Networld/Interop and many onsite private classroom settings to thousands of analysts. Tony is an authorized and certified Fluke Networks and Wireshark Instructor. His Pine Mountain Group CNA Level I and II certification demonstrates his vendor neutral approach to network design, support and implementations. Tony has architected, installed and supported various types of Residential Wireless High Speed as well as hundreds of WIFI hotspots. Tony uses a variety of technologies from Powerline, Wireless and wired technologies to find the most cost-efficient and reliable solution for his customers. Tony combines custom programs, open source and commercial software to ensure a simple support infrastructure.


Using CDPR For Network Awareness


Here’s a really neat little stocking stuffer.

The program is called “Cisco Discovery Protocol Reporter” or CDPR from a site with an stranger name than LoveMyTool; www.monkeymental.com. I will leave all the possible one liners to yourself.

This utility uses winpcap to listen for CDP packets. Sure you could use Wireshark from the command line, with a capture filter, etc…. But this is much more convenient.

To use it, simply go the application folder and run Cdpr.exe. Your output should look something like this:


Image001

In my example I want to determine which port my AP is on, so I will choose interface number 3.


Image002



And there you go, port 0/8 on switch stewie or 10.44.10.40.

If you want more detail, run it in verbose mode, with a –v option.


Image003

Have a great holiday season.


The_tech_firm



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