| Wireless network is more convenient, compared with traditional wired network, and provides the potential of accessing the Internet at any time and any place. Therefore it becomes the most exciting and fast growing field of computer network. Besides the hardware requirements, it is also a great challenge for software developers, especially the network protocols to support new features of wireless network. The 802.1x in link layer is only a part of requirements. In network layer, we have more work to do. The most popular network protocols, such as TCP/IP and IPv6, are all based on the assumption of immovable hosts, which means networks nodes will not change their access points during they are on line. So the IP address is not only an identity of a node, but also specifies the location of it. It is a good way to simplify routing mechanism. But the result is, when the moving happens, the node can never accessing the network unless it reconfigures its IP address. And the reconfiguration process will cause resetting of maintain connections. Mobile IPv6 and Mobile IP protocol are designed for this problem.Mobile IPv6 is the simplest protocol to implement in many of solutions. But it also has some problems to deal with, for example the performance issues. It is found that the handoff procedure which is described in Mobile IPv6 protocol will cause unacceptable communication delay. So some new methods were improved to enhance the performance. This paper will start with the standard Mobile IPv6 protocol to explain the horizontal and vertical handoff procedure, and then specify some popular improving method. In section 4, it describes an experimental platform and the experiment result. The last is the conclusions. |
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