| Currently, the vast majority of using WAN to support enterprise applications are building a centralized data center, and they generally use web applications as the foremost information application. The WAN bandwidth limitations and high transmission delay characteristics for the centralized data center efficiency brings new challenges, which often brings about the low speed data center access. And, HTTP protocol which is in the context of LAN also resulted in slow data transmission, without taking into account the WAN bandwidth, latency constraints and so on. Because data transmission speeds could not meet the needs of the enterprise, the paper design and implemente an enterprise web acceleration system by the research and analysis of the current primary WAN acceleration technology and HTTP protocol.The paper first summarizes the features and application scenarios of two types of enterprise web acceleration solutions,and the optimization techniques which they used are divided into data optimization, protocol optimization and load balancing. Based on this,the paper designs and develops the double-end gateway acceleration platform DGAP,which is deployed on the client gateway and server gateway. The IP layer intercept the data through the Netfilter/iptables framework, and use NAT technology to redirect the connection.And the application layer implemente various optimization techniques.The paper also focuses on the design and implementation of web acceleration systems based on DGAP,which including the cache module, compact module and TCP connection pooling module. Object caching techniques cache data and eliminate duplicate data.LZO compression algorithm reduce bandwidth consumption and increase data transmission speed. Connection pooling techniques optimize the TCP three-way handshake mechanism, and reduce the connection time. The system performance is tested on test-bed in laboratory,and the results indicate that the system has good acceleration effect. |
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