GRE隧道技术简介和应用

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GRE隧道技术简介和应用
华为技术有限公司
Catalog 目录
一、概述..........................................................................................................................................6
二、VPN简介....................................................................................................................................6
1. 隧道技术.............................................................................................................................6
2. 隧道协议分类.....................................................................................................................6
三、GRE简介....................................................................................................................................7
四、GRE的封装过程.........................................................................................................................7
1. 乘客协议.............................................................................................................................8
2. 封装协议.............................................................................................................................8
3. 运输协议.............................................................................................................................9
4. GRE的封装过程...................................................................................................................9
五、GRE报文头部格式...................................................................................................................10
1. RFC1701定义的GRE报文头部..........................................................................................10
2. RFC2784定义的GRE报文头部..........................................................................................12
3. 其它厂家规定的GRE报文头部.........................................................................................12
六、普通GRE隧道配置...................................................................................................................13
1. 创建Tunnel接口...............................................................................................................13
2. 激活Tunnel接口...............................................................................................................13
3. 配置Tunnel接口的网络地址...........................................................................................13
4. 配置Tunnel接口的源端地址和目的端地址...................................................................14
5. 配置GRE的安全选项.........................................................................................................14
6. 配置Tunnel的路由...........................................................................................................14
七、GRE应用和分析.......................................................................................................................15
1. 私网穿越公网的GRE隧道应用.........................................................................................15
2. PDSN的A10链路GRE隧道分析..........................................................................................17
3. WAPGW的GRE隧道分析.......................................................................................................21
八、后记........................................................................................................................................23
九、附录........................................................................................................................................23
1. GRE正式RFC文档...............................................................................................................23