Argh. Thanks to Chris Longo for pointing out the bad link. Fixed. The popular article by Duane Dunston featured on LinuxSecurity.com recently has now been made available in the form of PDF, due to requests from users. "This is a practical step by step guide showing how to use Dsniff, MRTG, IP Flow Meter, Tcpdump, NTOP, and Ngrep, and others. It also provides a discussion of how and why we should monitor network traffic.". . .
The popular article by Duane Dunston featured on LinuxSecurity.com recently has now been made available in the form of PDF, due to requests from users. "This is a practical step by step guide showing how to use Dsniff, MRTG, IP Flow Meter, Tcpdump, NTOP, and Ngrep, and others. It also provides a discussion of how and why we should monitor network traffic."

You can read Duane's article in Dsniff 'n the Mirror.

The PDF version is also now available.

The link for this article located at Duane Dunston is no longer available.