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Mobile IPv6 (MIPv6) and its proposed enhancements, fast MIPv6 (FMIPv6), hierarchical MIPv6 (HMIPv6), buffer management, link layer trigger (L2T) and a hybrid MIPv6 scheme (i.e. IMIPv6), are introduced. The average handover delay, throughput and handover signaling load of MIPv6, FMIPv6, HMIPv6 and IMIPv6 are simulated and analyzed with MIRAI-SF. The simulation results show that IMIPv6 can effectively solve TCP sequence disruption, lessen handover delay and control signaling load, and thus reduce network load of MIPv6 network.