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Fuelled to bring the Internet of Things concept to real life, the Internet Engineering Task Force is working on 6LoWPAN, in which the standard allows a vast number of smart objects to be deployed in local wireless sensor networks (WSNs) using the huge address space of IPv6 for data and information harvesting through the Internet. From the security point of view, 6LoWPAN/WSN will be open to security threats from the local network itself and the Internet. Cryptography techniques applied as the front line of defence or deterrent can easily be broken because of the weak secure nature of LoWPAN devices and the wireless environment. Compromised nodes could lead to insider attacks without being detected by any cryptography checking. An intrusion detection system (IDS) is, primarily needed as a second line of defence to monitor the network operations and raise an alarm in case of any anomaly. This paper …