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Overview: This paper showcases beacon-stuffing, a low bandwidth communication protocol for IEEE 802.11 networks that enables APs to communicate with clients without association. This enables clients to receive information from nearby APs even when they are disconnected, or when connected to another AP. The beacon-stuffing protocol is based on two key observations. APs embed content in Beacon and Probe Response frames, while clients overload Probe Requests to send data. Beacon-stuffing on various wireless cards on Windows XP and Windows Vista are implemented. These techniques require minimal driver changes at the clients and APs.
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