目 录（TOC Heading）
第 1 章 概 述............................................................................................................................1
1.1 PPPOE 协议的基本概念.................................................................................................. 1
1.1.1 PPPOE 协议出现的背景......................................................................................... 1
1.1.2 PPPOE 协议简介..................................................................................................1
1.2 总结.................................................................................................................................. 2
1.3 思考.................................................................................................................................. 2
第 2 章 PPPOE 的发现阶段.....................................................................................................1
2.1 PPPOE 的初始化过程.......................................................................................................1
2.1.1 以太网的帧格式.....................................................................................................1
2.1.2 PPPOE 的数据报文格式......................................................................................... 2
2.1.3 PPPOE 发现阶段的数据报文.................................................................................3
2.1.3.1 PPPOE 数据报文中 Tag（标记）的格式...............................................................3
2.1.3.2 PADI（PPPOE Active Discovery Initiation）报文.................................................5
2.1.3.3 PADO（PPPOE Active Discovery Offer）报文.....................................................6
2.1.3.4 PADR（PPPOE Active Discovery Request）报文...............................................6
2.1.3.5 PADS（PPPOE Active Discovery Session-confirmation）报文............................7
2.1.3.6 PADT（PPPOE Active Discovery Terminate）报文.............................................7
2.2 总结.................................................................................................................................. 8
2.3 思考.................................................................................................................................. 8
第 3 章 PPPOE 的会话阶段.....................................................................................................9
3.1 PPPOE 的会话过程.......................................................................................................... 9
3.2 总结.................................................................................................................................. 9
3.3 思考.................................................................................................................................. 9
第 4 章 参考资料....................................................................................................................10
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