In the story we recently covered where Terry Childs had locked San Fransisco officials out of their own network, there is a new development.
He’s handed over the passcode to the Mayor, Gavin Newsom. It seems he came to his senses and he also seems to have VERY little faith in the IT administration for the [...]

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 [...]

Another flaw in Cisco’s IOS, this time a problem with FTP, the mechanism used to update the firmware on Cisco devices (routers & switches mostly).
You really don’t want someone playing around with your configuration files on your router do you?

IOS FTP, which comes disabled by default in IOS, is used to upload IOS software images [...]

This is an excellent article you might find useful covering the use of the capture command in Cisco PIX firewalls.

A vital tool to use when troubleshooting computer networking problems and monitoring computer networks is a packet sniffer. That being said, one of the best methods to use when troubleshooting connection problems or monitoring suspicious network [...]