ADSL中的PPPOE协议

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摘要

Internet的快速发展，致使宽带接入成为广大互联网用户最为迫切的需求，ADSL宽带接入技术在众多宽带接入技术中因而能脱颖而出。ADSL宽带接入技术，即通过PPPOE虚拟拨号连接互联网技术势必成为现代人们分享资源，进行信息交流的主要方式。本文从介绍ADSL宽带接入技术的特点、系统结构和网络结构，以及几种常用的ADSL应用方式和接入方式入手。通过对ADSL三种编码调制技术的对比分析，解读ADSL实现用户高速接入Internet网络，实现高速率传递的本质。重点阐述PPPOE协议，介绍PPPOE协议的特点、工作原理、协议框架与帧结构，并对PPPOE在BAS上的几种实现方式进行了对比分析。从设计的角度分析PPPOE协议的发送与接收机制，提出了PPPOE协议在Windows系统下实现虚拟拨号连接互联网具体实现方法。另外对于PPPOE协议应用的一个重要阶段——PPPOE发现，文中详细地介绍了其相关算法流程。

关键词：ADSL ；编码调制；PPPOE协议；PPP会话

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Abstract

The fast development of Internet, cause broadband access become into the most urgent demand of general Internet user, The ADSL broadband access technology thus can fully expose talent from multitudinous broadband access technology.The ADSL broadband access technology, namely it will become the fundamental mode that the modern people through the hypothesized digit dialing of PPPOE connection Internet to share the resources, and carry on the communication. This article from introduces the characteristic of ADSL broadband access technology, the system structure and the network architecture, as well as several commonly used ADSL application way and turning on way obtaining.Through contrast analysis the ADSL three kind of coded modulation technology, recognition the ADSL realize user to turn on the Internet network with high speed, realizes the high speed transmission essence. In this text also will elaborate the PPPOE agreement, introduced the characteristic of PPPOE agreement, the work principle, the framework agreement and the frame structure, and contrast analysis everal realization ways that has carried on the to PPPOE on the BAS. Analyze the PPPOE agreement’s transmission and the receive mechanism from the design angle, Proposed the concrete realization method of PPPOE agreement realizes the hypothesized digit dialing to connection Internet under the Windows system.Moreover, Regarding a important stage of PPPOE agreement application——PPPOE discover , in the article introduced its related algorithm flow in detail.

Key words：ADSL；Coded modulate；PPPOE agreement；PPP session

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目录

1 引言 (1)

2 ADSL技术 (2)

2.1 ADSL简介 (2)

2.2 ADSL的结构 (3)

2.2.1 ADSL网络结构 (3)

2.2.2 ADSL系统结构 (4)

2.3 ADSL系统的接入模型 (4)

2.4 ADSL技术的应用 (5)

3 ADSL编码调制技术 (7)

3.1 单载波调制编码技术 (7)

3.2 多载波调制编码技术 (8)

4 PPPOE (11)

4.1 PPPOE协议简介 (11)

4.1.1 PPPOE的特点 (11)

4.1.2 PPPOE的工作原理 (12)

4.2 PPPOE协议框架 (13)

4.3 PPP会话 (14)

4.3.1 PPP会话终结 (14)

4.3.2 PPP会话续传(L2TP VPN) (15)

4.4 PPPOE在BAS上的实现 (16)

4.4.1 PPPOE与VLAN的结合 (16)

4.4.2 PPPOE对多业务选择的支持 (17)

4.4.3 PPPOE对组播的支持 (17)

5 WIN XP下ADSL中的PPPOE实现 (19)

5.1 NDIS体系 (19)

5.2 PPPOE的发送/接收机制 (20)

5.2.1 发送数据 (20)

4.2.2 接收数据 (21)

5.3 WIN XP 下PPPOE配置 (24)

5.4 PPPOE 协议及其在校园网络中的应用 (25)

6 PPPOE发现的算法流程 (27)

6 结束语 (30)

致谢....................................................... 错误！未定义书签。参考文献. (31)

附页 (32)