Design and implementation of interconnecting IPv6 wireless sensor networks with the Internet

6LoWPAN gives a great opportunity for sensor networks to communicate with the Internet using IP. However, it´s difficult for the 6LoWPAN sensor networks to be operated from the Internet directly. In this paper, an access gateway and sensor nodes based on 6LoWPAN are designed and constructed to make the interconnection feasible. This solution allows legal Internet IPv4 client to access and control each specific sensor nodes using IPv6. Furthermore, it enables different sensor networks to exchange information through a 6to4 tunnel implementation. Besides, the performance of the WSN has been evaluated and analyzed. The experimental results show that the interconnection between IPv6 WSN and Internet is successful and reliable.