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Wireless Network Monitoring Using Coordinated SamplingChris McDonald (UWA), Udayan Deshpande and David Kotz (Dartmouth College) 11th April, Seminar Room 1.24 AbstractWireless networks are deployed in home, university, business, military and hospital environments, and are increasingly used for mission-critical applications like VoIP or financial applications. Monitoring the health of these networks, whether it is for failure, coverage or attacks, is important in terms of security, connectivity, cost, and performance.Effective monitoring of wireless network traffic, using commodity hardware, is a challenging task due to the limitations of the hardware. IEEE 802.11 networks support multiple channels, and a wireless interface can monitor only a single channel at one time. Thus, capturing all frames passing an interface on all channels is an impossible task, and we need strategies to capture the most representative sample. The competing goals of effective wireless monitoring are to capture as many frames as possible, while minimizing the number of those frames that are captured redundantly by more than one monitoring station. Both goals may be addressed with a sampling strategy that directs neighboring monitoring stations to different channels during any period. This seminar will motivate and introduce our coordinated sampling strategy that meets these goals, and provides a solid foundation for focused sampling and intrusion detection. ----- This seminar will provide a quick overview of the operation of wireless networks, and be accessible to a wide audience. |
