| Summary: | 碩士 === 淡江大學 === 電機工程學系 === 90 === In order to deal with the much more requirements from the users in present wide area network, it is a familiar thing to make a series websites have several duplicate websites at the same time.The general way is to make a star-connection by using the Cluster topology; in the center of a star-connection is a website to make those packages get into this Cluster together, and we called this kind of website “a Dispatcher” or “a Web switch.”Generally speaking, it’s usually regionally to set up the duplicate websites (it means geographic regionally), it means that the duplicate websites in the same Cluster will be set in the same regional Cluster.In the other hand, another setting form to reproduce websites is to make Cluster be an unit form and each Clusters are set in different networking domains; these duplicate sites will be distributed in every Clusters.When the Cluster in a networking domain can’t provide service because of overloading, the Web switch in the Cluster will transfer the user’s request to the Cluster in other domains.The major point in this paper is to introduce an approach to implement Load Balance and Load Sharing on WAN. By this way, web switch redirect the request from original server to duplicate server. Furthermore, we also consider reducing the spending time and the redirect processing steps by Hybrid TCP-UDP method, and use state tables to determine which server is the best for clients and make sure we can make efficiency redirect method come true.
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