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CDPSnarf if a network sniffer exclusively written to extract information from CDP packets. It provides all the information a “show cdp neighbors detail” command would return on a Cisco router and even more.

The application is written in C using the popular PCAP library.

Sample Output

Cisco AIR-AP1231G-E-K9 Access Point:

$ sudo ./cdpsnarf eth2
Waiting for a CDP packet...

[#0] Sniffed CDP advertisement with a size of 367 bytes.
——————————————————-
CDP Version: 2
TTL: 180 ms
Checksum: 0×7282

Device ID: cisco-ap.mydomain.net

Software version: Cisco IOS Software, C1200 Software (C1200-K9W7-M),
Version 12.3(8)JEA, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Wed 23-Aug-06 16:42 by kellythw

Platform: cisco AIR-AP1231G-E-K9

Addresses: 1
Address #: 1
Protocol type: [1] NLPID format
Protocol: [0xCC] IP
IP Address: 157.228.87.1

Port ID: Dot11Radio0

Capabilities:
[0x02] Transparent bridge

You can download CDPSnarf here:

CDPSnarf 0.1.6

Or read more here.

Technorati Tags: cdp, cdp packet sniffer, cdpsnarf, cisco, hacking routers, Hacking Tools, hacking-cisco, hacking-networks, Network Hacking