1 Proactive DAD: An L2-assisted Fast Address Acquisition Strategy for Mobile IPv6 Networks Chien-Chao Tseng Department of Computer Science and Information Engineering National Chiao-Tung University Hsinchu, Taiwan 300 Yung-Chang Wong 1 Department of Computer Science and Information Engineering Providence University Taichung, Taiwan 433 Li-Hsing Yen Department of Computer Science and Information Engineering Chung Hua University Hsinchu, Taiwan 300 Kai-Cheng Hsu Department of Computer Science and Information Engineering National Chiao-Tung University Hsinchu, Taiwan 300 1 Contact author: Yung-Chang Wong, E-mail: ycwong@pu.edu.tw