【摘要】：目前,企業(yè)級用戶的廣域網(wǎng)傳輸問題主要來自兩方面,即鏈路與應(yīng)用。鏈路問題包括帶寬受限、網(wǎng)絡(luò)時延大、丟包率嚴(yán)重等;應(yīng)用的問題則集中于大數(shù)據(jù)量的傳輸,以及應(yīng)用自身在廣域網(wǎng)環(huán)境下的低傳輸效率。 廣域網(wǎng)加速技術(shù)提供了對以上網(wǎng)絡(luò)傳輸和應(yīng)用交互問題的一整套優(yōu)化技術(shù)。廣域網(wǎng)加速技術(shù)起源于21世紀(jì)初,主要用于解決企業(yè)級用戶廣域網(wǎng)的數(shù)據(jù)傳輸及應(yīng)用訪問問題。在廣域網(wǎng)加速中有多種技術(shù)可以達(dá)到加速的目的,論文主要研究基于數(shù)據(jù)替換與TCP優(yōu)化技術(shù)為基礎(chǔ)的廣域網(wǎng)加速技術(shù),這兩種技術(shù)結(jié)合起來在廣域網(wǎng)加速中的效果明顯。在廣域網(wǎng)加速技術(shù)中,數(shù)據(jù)存儲的地位至關(guān)重要,因?yàn)榧铀俚脑硎峭ㄟ^數(shù)據(jù)替換實(shí)現(xiàn)的,數(shù)據(jù)替換的基礎(chǔ)就是數(shù)據(jù)存儲。發(fā)送端發(fā)送的數(shù)據(jù)到達(dá)廣域網(wǎng)加速系統(tǒng)后,首先被存儲起來,然后被存儲的數(shù)據(jù)進(jìn)行分析,分析后進(jìn)行數(shù)據(jù)替換,把大塊的數(shù)據(jù)用少量的特殊索引進(jìn)行替換,最后把替換后的數(shù)據(jù)發(fā)送到目的地址。在目的網(wǎng)絡(luò)中,接收到的少量的特殊索引進(jìn)行反向的查找,找到相應(yīng)的大塊的數(shù)據(jù)進(jìn)行還原,還原后發(fā)送到目的地址。對于目的地址返回給發(fā)送方的信息也是經(jīng)過同樣的流程。從加速的原理可以看出,廣域網(wǎng)加速系統(tǒng)主要包含了TCP透明代理模塊,用來接收局域網(wǎng)中發(fā)送出來的數(shù)據(jù),并且把數(shù)據(jù)需要重新組合成為大塊的數(shù)據(jù),供替換使用,同時需要能夠把替換后的數(shù)據(jù)重新分片發(fā)送出去;特征數(shù)據(jù)替換模塊,主要負(fù)責(zé)選擇數(shù)據(jù)塊進(jìn)行替換,選擇替換的數(shù)據(jù)塊的索引;數(shù)據(jù)庫同步模塊,發(fā)送端與接收端必須要能保證完整的數(shù)據(jù)庫同步,才能正常的完成替換功能,實(shí)現(xiàn)廣域網(wǎng)加速的效果。如何有效組織數(shù)據(jù)存儲以及數(shù)據(jù)的同步,更新等是論文研究的重點(diǎn)。 測試結(jié)果表明,文中采用的各種數(shù)據(jù)結(jié)構(gòu)以及方法可以達(dá)到加速的效果,能突破鏈路的限制,有效的提高多種應(yīng)用在廣域網(wǎng)環(huán)境中的傳輸效率。
[Abstract]:At present, the problem of wide area network (WAN) transmission for enterprise users mainly comes from two aspects: link and application. The link problems include limited bandwidth, large network delay, serious packet loss rate and so on, while the application problems focus on the transmission of large amount of data and the low transmission efficiency of the application in WAN environment. WAN acceleration technology provides a complete set of optimization techniques for the above network transmission and application interaction problems. WAN acceleration technology originated in the beginning of the 21st century, mainly used to solve the problem of data transmission and application access of enterprise wide area network (WAN). There are many kinds of technologies to accelerate the WAN. This paper mainly studies the WAN acceleration technology based on data replacement and TCP optimization technology. The combination of these two technologies is effective in WAN acceleration. In WAN acceleration technology, the position of data storage is very important, because the principle of acceleration is realized by data replacement, which is based on data storage. When the data sent by the sender reaches the WAN acceleration system, it is stored first, then the stored data is analyzed, then the data is replaced, and the bulk of the data is replaced with a small number of special indexes. Finally, the replaced data is sent to the destination address. In the destination network, a small number of special indexes received are searched in reverse, the corresponding chunks of data are found and restored, and then sent to the destination address. Information returned to the sender from the destination address goes through the same process. From the principle of acceleration, we can see that the WAN acceleration system mainly contains TCP transparent proxy module, which is used to receive the data sent out from LAN, and to recombine the data into large pieces of data for replacement. At the same time, we need to be able to send the replaced data back into pieces; the feature data replacement module is mainly responsible for selecting the data block to replace, selecting the index of the replaced data block; the database synchronization module, The sender and receiver must be able to ensure the complete synchronization of the database in order to complete the replacement function normally and realize the effect of WAN acceleration. How to effectively organize data storage and data synchronization and update is the focus of this paper. The test results show that all kinds of data structures and methods used in this paper can achieve the acceleration effect, break through the limitation of link, and effectively improve the transmission efficiency of many applications in WAN environment.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP393.2;TP333

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 潘馳;基于廣域網(wǎng)數(shù)據(jù)壓縮TCP代理的安全性設(shè)計(jì)與改進(jìn)[D];南京郵電大學(xué);2013年

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本文編號：2264975