使用CMCC连接VPN问题分析

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1、关于使用CMCC网络连接VPN问题分析某VPN使用PPTP隧道协议，客户端通过明文的PAP认证来实现与VPN服务器的连接。PPTP连接过程如下：PPTPClientPPTPServerTCPCern«ti©nFinisr・图一：PPTP协商连接过程使用电信ADSL、电信Chinanet、移动CMCC三种不同的上网方式分别进行了连接VPN的测试，其中电信ADSL和Chinanet是可以正常与VPN服务器连接的，而CMCC是不成功的。抓包情况如下：40.021951219.132.14.198192.168

2、.1.113TCPTCPpptp>funkproxy[syn,ack]seq-0Ack«lw1nM096Len-050.02204360.04109070.043605oa192.168.1.113219.132.14.198219.132.14.198219.132.14.198192.168.1.113192.16&1・口3PPTPTCPPPTPStart-Control-Connect1on・Requestpptp>funkproxy[ack]seq-1Acid57win-3940Len-0Sta

3、rt-control-connect1on-ReplySeq-157Aclc・325win«3928Len«Owhohas192.168.1.1^Tell192.168.1.113192.16&1•丄5satf8:dl:ll:f2:e5:6410.000000inrelcor_3e:07:22Broadcastarpintelcor_3e:07:22arp20.007099f8:dl:ll:f2:e5:6490.067081100.067137110.080064120.083093130・096099

4、140.161101150.161298066972137782182.138028192.160557202.160946212.187941222.188242232.281164242.281469252.472223262.472617272.472892282.473064292.473157302.677139219.132.14.198219.132.14.198192.168.1.113192.168.1.113192.168.1.113219.132.14.198TCPPPTPPPTP

5、pptp>funkproxy[ACK]Outgolng-call-Replyset-Link-Info192.168.1.113219.132.14.198pppLCFConfIguratlonRequest219.132.14.198192.168.1.113TCPpptp>funkproxy[ack1[219.132.14.198192.168.1.113pppLCFConfiguratlonRequestSeq・189Ack-349wln-4072Len-019Z.168.1.113192・168

6、•丄・：113219.132.14.198192.168.1.113219.132.14.198192.168.1.113219.132.14.198192.168.1.113219.132.14.198192.168・1・UL3219.132.14.198192.168.1.113192.16&1.U3192.168.1.113192.168.1.113219.132.14.1982197132.14.198219.132.14.198192.168.1.113219.132.14.198192.16

7、8.1.113219.132.14.198192.168.1.113219.132.14.198192.168.1.113219.132.14.198192.168.1.113219.132.14.198219.132.14.198219.132.14.198219.132.14.198PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPLCFConrigurationLCFConfigyrationlcfconfigurationLCFConflgurationLCFConfIgurat

8、lonLCFConfIguratlonLCFconfIgurat1onLCFconfigurationLCFConfIguratlonLCFconfIgurax1onLCFConflguraxion•RequestRejectRequestRequestAckNakRequestNakRequestAck313.189079219.132.14.198192.168.1.113192.168.1.113pptpset-Link・xnfopp