In order to improve the handover performance and reduce the delay of handover, the paper has made the following tasks:1. we have analyzed deeply to process of the mobile IPv6 protocol handover, and point out the delay which the various steps have brought;2. We have custom made prom dresses analyzed handover process of the Mobile IPv6 protocol and improved protocol (such as HMIPv6 protocol, FMIPv6 Protocol), and pointed out that the design sell discount wedding dresses ideas, the improve methods and the problems for these protocol. We have analyzed deeply for direction of improved the handover delay;3. Based on the analysis and summing up, we have proposed the scheme named handover in hierarchical mobile IPv6 Based on the Fast DAD mechanism in visual domain. By introducing the concept of virtual domain based on HMIPv6, we defined MAP and neighbor blog lace wedding dresses MAP which were defined in HMIPv6 protocol in the same domain, and make new shoes 2010 servers in visual domain which ware defined in this paper replace mobile node to do DAD operations in handover process. When the mobile node moved in the network, there is no need to duplicate custom made prom dresses address detection, as moved in the same domain. The scheme have solved problem which needs to passive waiting in the traditional duplicate addresses detection, this is the innovation in this paper;4. In the means of experiment, NS2 simulation platform was used in this paper. NS2 is an open source, free simulation platform.
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