广域网加速网关设计与实现  

Design and implementation of WAN acceleration gateway

作　　者：王建新[1] 王捷[2] 徐涛[1] 郭振华[1] 董苹苹[1] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083 [2]郑州轻工业学院计算机与通信工程学院,河南郑州450002

出　　处：《中南大学学报（自然科学版）》2012年第10期3879-3885,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(61103204;61173169);新世纪优秀人才支持计划项目(NCET-10-0798)

摘　　要：针对广域网带宽限制和高延时特性给企业信息化应用带来的问题,对广域网加速技术进行研究,从传输层和应用层的角度出发,采用分层框架结构,基于epoll事件驱动机制的数据传输模型及滑动窗口的流量控制机制,设计并实现广域网加速网关(AccGw)。AccGw采用私有的数据包格式,以加速插件形式提供数据压缩、数据缓存、协议优化等多种数据优化及应用优化技术,为不同加速应用开发提供统一的支撑平台和接口支持,方便系统横向扩展。基于AccGw方法扩展TCP协议、Exchange邮件服务、FTP协议和HTTP等加速插件,为相应应用提供加速。实验测试表明:加速网关具有良好的性能和加速效果,能支持大量并发用户和获得较大的吞吐量,可满足中、小型企业加速应用需求。The bandwidth limitations and high latency characteristics of WAN influence the information application of enterprise. On the basis of the research of the WAN acceleration technology, a WAN acceleration gateway （AccGw） with layered frame structure was designed, which adopts data transfer model based on epoll event-driven model and flow control mechanism based on sliding window. AccGw provides a unified support platform and interface for the development of acceleration application by designing a special data packet format and providing acceleration plug-in of optimization techniques based on data compression, data cache, and TCP protocol optimization. The method developed Exchange, FTP and HTTP acceleration plug-ins based on AccGw. The experimental results indicate that the platform has good performance, which can support large numbers of concurrent users, achieve large throughput, and meet the acceleration requirement of small and medium sized enterprises.

关 键 词：广域网加速技术 加速网关 数据传输模型 流量控制 加速插件 

分 类 号：TP393.2[自动化与计算机技术—计算机应用技术]