Mobile communication is increasingly oriented towards the usage of all Internet Protocol (IP) networks as fixed network components. Mobility support for Internet devices is quite important for consumer electronics and the number of the handled device is growing up quickly. However, the IP addresses are not enough for the number of the rapidly grow devices in the All-IP generation. So the Internet Protocol Version Six (IPv6) is adopted to solve these problems. Mobile IP technology is one of the important supporting technical in the construction of pervasive computing environment. This book is a study of the Mobile IPv6 issues using OPNET IPv6 model. Mobile IPv6 (MIPv6) allows Mobile Node (MN) to remain reachable while moving around in the Internet. In Mobile IPv6, each MN is always identified by its home address, regardless of its current point of attachment to the Internet. While situated away from its home, MN is also associated with a Care-of Address (CoA), which provides information about the MN's current location.