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Utilization of IP in sensor networks converges them to a unified and simple naming and addressing hierarchy. Thereby, allowing us to be benefited from the existing well established tools and technologies of IP networks. Along with many other unveiled issues, securing IP-USN (IP based Ubiquitous Sensor Network) is of great concern for researchers so that future market satisfaction and demands can be met. Without a proper security framework, it is hard to envisaged IP-USN realm. In this paper we propose a novel Intrusion Detection Framework for IPUSN. According to the best of our knowledge this is the first security framework for any kind of IP based sensor devices. The proposed scheme is fast, lightweight in terms of computation and memory, which make it appropriate for resource constrained sensor devices.