Ranum's Network Flight Recorder (see Resources), as opposed to host-based detectors such as Tripwire.

CNN: Analysis: Linux security

"It's true that it's impossible to completely defend against denial of service attacks and still be accessible, " says Marcus Ranum, chief security officer of Tenable Security.

FORBES: Magazine Article

Markus Ranum, a veteran of the network security industry and a noted critic of the cyber war hype, points to another similarity with the Cold War.

WSJ: Battling the Cyber Warmongers