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 thesis is a study of the Mobile IPv6 issues using Optimized Network Engineering Tools (OPNET 14) 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, a MN is also associated with a Care of Address (CoA), which provides information about the MN's current location. The main topologies were simulated (Extended Service Set (ESS) with MN, MIPv6 handover with default direction, MIPv6 handover with changing direction of movement, MIPv6 handover with changing speed of movement, MIPv6 handover with ping pong movement, and MN movement with one AP). The effect of different parameters, loads, movement, multiple AP's were taking into consideration for the mentioned scenarios. Simulation results showed the effect of handover on data transfer, the handover happened without disconnection between MN and Correspondent Node (CN). The results were satisfactory for all scenarios under different conditions and the delays were acceptable.