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Network Computing: Always-On WLAN Monitor

May 02, 2003, 11:30 (2 Talkback[s])
(Other stories by Saurabh Bhasin)

"I tested Guard 3.0 in our Syracuse University Real-World Labs. The setup was simple. I powered on the rack-mountable server appliance and accessed the Java Web management console after configuring a few parameters using the command-line interface. The server runs on a customized version of Red Hat Linux and uses PostgreSQL to store information fed to it over Ethernet from the wireless sensors.

"I also had to install Java Runtime Environment (JRE) 1.4.1 Java HotSpot Client Virtual Machine (free from Sun Microsystems).

"Guard comes with two wireless sensors that run an embedded Linux OS and include Cisco Systems' Aironet 350 and Ethernet interfaces. Determining the appropriate number of sensors required for complete coverage and their optimum location in your facility requires time and effort. AirDefense estimates that a sensor typically covers a 1,000-foot radius, but I could test it only up to 170 feet due to the lab building's physical constraints..."

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