PPTP 隧道技术 ................................................................................................................................. 2 一、控制连接和隧道维护 ....................................................................................................... 2 1.Start-control-connection-request 报文 ......................................................................... 4 2.Start-Control-Connection-Reply 报文 ............................................................................ 5 3.Outgoing-call-request 报文 ........................................................................................... 6 4.Outgoing-Call-Reply 报文 .............................................................................................. 8 5.Set-Link-Info 报文 .......................................................................................................... 9 6.Echo request 报文 ....................................................................................................... 10 7.Echo-reply 报文 ........................................................................................................... 10 8.Call-Clear-Request 报文 ............................................................................................... 10 9.Call-Disconnect-Notify 报文 ........................................................................................ 11 10.Stop-Control-Connection-Request 报文 .................................................................... 11 11.Stop-Control-Connection-Reply 报文 ........................................................................ 11 二、PPP 协商过程 ................................................................................................................. 12 1.LCP 协商 ....................................................................................................................... 12 2.PPP 协议的身份验证.....................................
