【摘要】：PPPoE協(xié)議基于兩個(gè)廣泛接受的標(biāo)準(zhǔn):PPP點(diǎn)對(duì)點(diǎn)協(xié)議和802.3以太網(wǎng)標(biāo)準(zhǔn)。PPPoE的目的是在以太網(wǎng)共享介質(zhì)的網(wǎng)絡(luò)上提供一條的點(diǎn)到點(diǎn)的邏輯鏈路,從而使得以太網(wǎng)中的用戶(hù)都能與寬帶接入服務(wù)器建立邏輯PPP連接。PPPoE充分利用了以太網(wǎng)的尋址能力,通過(guò)這種方式,用戶(hù)不需要深刻地了解局域網(wǎng)技術(shù)只需要通過(guò)用戶(hù)名密碼撥號(hào)上網(wǎng);并且運(yùn)營(yíng)商也不用耗費(fèi)巨資改造目前的局域網(wǎng)結(jié)構(gòu)。PPPoE是目前廣泛使用的接入網(wǎng)協(xié)議,提供良好的鑒權(quán)、計(jì)費(fèi)機(jī)制。雖然目前城市網(wǎng)絡(luò)構(gòu)建良好,接入網(wǎng)采用光纖、5類(lèi)雙絞線等支持高帶寬、大容量的傳輸介質(zhì),然而在某些特殊場(chǎng)景下,例如老舊的網(wǎng)絡(luò),接入網(wǎng)鏈路質(zhì)量無(wú)法得到保障。本文因?yàn)轫?xiàng)目需求,需要對(duì)這樣的網(wǎng)絡(luò)進(jìn)行網(wǎng)絡(luò)改造。由于實(shí)際條件的限制,采用通過(guò)網(wǎng)絡(luò)協(xié)議優(yōu)化的方式來(lái)為特殊的網(wǎng)絡(luò)場(chǎng)景服務(wù)。本文介紹了PPPoE協(xié)議以及PPP協(xié)議,分析了網(wǎng)絡(luò)中時(shí)延以及網(wǎng)絡(luò)終端設(shè)備處理能力差異的原因以及解決方案,并且提出了服務(wù)器根據(jù)終端設(shè)備鏈路質(zhì)量動(dòng)態(tài)實(shí)施時(shí)延容忍機(jī)制,改善網(wǎng)絡(luò)設(shè)備由于鏈路質(zhì)量而頻道掉線的問(wèn)題,除此之外還提出通過(guò)對(duì)PPPoE頭部壓縮以及IP頭部壓縮提高網(wǎng)絡(luò)鏈路帶寬利用率。在實(shí)現(xiàn)部分,本文提出服務(wù)器采用轉(zhuǎn)發(fā)與控制分離的分布式架構(gòu),從而可以運(yùn)用于大規(guī)模的路由接入,提高轉(zhuǎn)發(fā)性能;客戶(hù)端采用嵌入式Linux,在程序模塊設(shè)計(jì)中針對(duì)性地實(shí)現(xiàn)PPPoE協(xié)議主要功能,盡量使代碼簡(jiǎn)潔。最后根據(jù)實(shí)際應(yīng)用場(chǎng)景模擬了相似的應(yīng)用場(chǎng)景,通過(guò)測(cè)試表明對(duì)PPPoE協(xié)議的優(yōu)化,在鏈路質(zhì)量不佳的情況下增加了客戶(hù)端的同時(shí)在線數(shù),并且減小了傳輸時(shí)延、節(jié)約了網(wǎng)絡(luò)帶寬,滿(mǎn)足項(xiàng)目需求。
[Abstract]:The PPPoE protocol is based on two widely accepted standards: the PPP point-to-point protocol and the 802.3 Ethernet standard. PPPoE aims to provide a point-to-point logical link on a network of Ethernet shared media. So that all users in Ethernet can establish logical PPP connection with broadband access server. PPPoE makes full use of the addressing ability of Ethernet, through this way, Users do not need to deeply understand the LAN technology only through user name and password dial-up Internet access, and operators do not have to spend a lot of money to reform the current LAN structure. PPPoE is a widely used access network protocol, providing good authentication, Accounting mechanism. Although the current urban network is well constructed, the access network uses high bandwidth and large capacity transmission media such as optical fiber, 5 kinds of twisted pair cable, etc. However, in some special scenarios, such as the old network, the link quality of access network can not be guaranteed. Because of project requirement, this article needs to carry on the network transformation to this kind of network. Due to the limitation of practical conditions, network protocol optimization is adopted to serve special network scenarios. This paper introduces the PPPoE protocol and the PPP protocol, analyzes the reasons and solutions of the delay and the difference of the network terminal equipment processing capacity, and proposes a dynamic delay tolerance mechanism based on the terminal equipment link quality. In addition to improving the problem of channel dropping due to link quality in network devices, it is also proposed to improve the bandwidth utilization of network links by compression of PPPoE headers and IP header compression. In the implementation part, this paper proposes that the server adopts distributed architecture of separate forwarding and control, which can be applied to large-scale routing access and improve forwarding performance. The client adopts embedded Linux, to realize the main functions of PPPoE protocol in the program module design, and makes the code as simple as possible. Finally, the similar application scenarios are simulated according to the actual application scenarios. The test results show that the optimization of PPPoE protocol can increase the number of simultaneously online clients in the case of poor link quality, reduce the transmission delay and save the network bandwidth. Meet project requirements.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TP393.11;TP393.04

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本文編號(hào)：2280851