The exponential increase in the deployment of IEEE 802.11-based Wireless LAN (WLAN) technology has transformed it into an essential building block of the networking infrastructure of commercial enterprises. How to effectively manage these WLAN networks and stop malicious intruders are the two main barriers for further spread of this technology. At the same time, the enormous economies of scale behind IEEE 802.11-basedWLAN products also result in rapid technological advances and astounding pricing efficiencies. This paper describes the design, implementation, and evaluation of a scalable wireless LAN traffic monitoring system called WIreless Network senTRY (Wintry), which provides real-time visibility of the usage of an enterprise's wireless links in a way that is completely transparent to the monitored WLAN networks.
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