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Building a campus-wide wireless LAN measurement system faces many efficiency, scalability and security challenges. To address these challenges, the authors developed a distributed Wi-Fi sniffing program called Saluki. Compared to their previous implementation and to other available sniffing programs, Saluki has the following advantages: its small footprint makes it suitable for a resource-constrained Linux platform, such as those in commercial Wi-Fi access points; the frame-capture rate increased more than three-fold over tcpdump with minimal frame loss; all traffic between this sniffer and the back-end server was secured using 128-bit encryption; and the traffic load on the backbone network was reduced to only 30% of that in their previous implementation.
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