我正在尝试在 Linux（Kubuntu 9.10）下配置我已经在 Windows 中使用的 VPN。
我安装了 network-manager-pptp 包，并在网络管理器下添加了 VPN。这些是“高级”按钮下的参数：
- 身份验证方法：PAP、CHAP、MSCHAP、MSCHAP2、EAP
（我也尝试过“MSCHAP、MSCHAP2”） - 使用 MPPE 加密: 是
- 加密：任意
- 使用状态加密：否
- 允许 BSD 压缩：是
- 允许 Deflate 压缩：是
- 允许 TCP 头压缩：是
- 发送 PPP 回显数据包: 否
当我尝试连接时，它不起作用，这是我在系统日志中得到的内容：
2010-04-08 13:53:47 pcelena NetworkManager <info> Starting VPN service 'org.freedesktop.NetworkManager.pptp'...
2010-04-08 13:53:47 pcelena NetworkManager <info> VPN service 'org.freedesktop.NetworkManager.pptp' started (org.freedesktop.NetworkManager.pptp), PID 4931
2010-04-08 13:53:47 pcelena NetworkManager <info> VPN service 'org.freedesktop.NetworkManager.pptp' just appeared, activating connections
2010-04-08 13:53:47 pcelena pppd[4932] Plugin /usr/lib/pppd/2.4.5//nm-pptp-pppd-plugin.so loaded.
2010-04-08 13:53:47 pcelena NetworkManager <info> VPN plugin state changed: 3
2010-04-08 13:53:47 pcelena pppd[4932] pppd 2.4.5 started by root, uid 0
2010-04-08 13:53:47 pcelena NetworkManager <info> VPN connection 'MYVPN' (Connect) reply received.
2010-04-08 13:53:47 pcelena NetworkManager SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
2010-04-08 13:53:47 pcelena NetworkManager SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
2010-04-08 13:53:47 pcelena pppd[4932] Using interface ppp0
2010-04-08 13:53:47 pcelena pppd[4932] Connect: ppp0 <--> /dev/pts/2
2010-04-08 13:53:47 pcelena pptp[4934] nm-pptp-service-4931 log[main:pptp.c:314]: The synchronous pptp option is NOT activated
2010-04-08 13:53:47 pcelena pptp[4927] nm-pptp-service-4918 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'
2010-04-08 13:53:47 pcelena pptp[4927] nm-pptp-service-4918 log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
2010-04-08 13:53:47 pcelena pptp[4927] nm-pptp-service-4918 log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 1, peer's call ID 14800).
2010-04-08 13:53:48 pcelena pppd[4932] CHAP authentication succeeded
2010-04-08 13:53:48 pcelena pppd[4932] CHAP authentication succeeded
2010-04-08 13:53:48 pcelena pppd[4932] LCP terminated by peer
2010-04-08 13:53:48 pcelena pptp[4927] nm-pptp-service-4918 log[ctrlp_disp:pptp_ctrl.c:929]: Call disconnect notification received (call id 14800)
2010-04-08 13:53:48 pcelena pptp[4927] nm-pptp-service-4918 log[ctrlp_disp:pptp_ctrl.c:788]: Received Stop Control Connection Request.
2010-04-08 13:53:48 pcelena pptp[4927] nm-pptp-service-4918 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 4 'Stop-Control-Connection-Reply'
2010-04-08 13:53:48 pcelena pptp[4927] nm-pptp-service-4918 log[callmgr_main:pptp_callmgr.c:258]: Closing connection (shutdown)
2010-04-08 13:53:48 pcelena pptp[4927] nm-pptp-service-4918 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
2010-04-08 13:53:48 pcelena pptp[4927] nm-pptp-service-4918 log[callmgr_main:pptp_callmgr.c:258]: Closing connection (shutdown)
2010-04-08 13:53:48 pcelena pptp[4927] nm-pptp-service-4918 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
2010-04-08 13:53:48 pcelena pptp[4927] nm-pptp-service-4918 log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
2010-04-08 13:53:48 pcelena pppd[4932] Modem hangup
2010-04-08 13:53:48 pcelena pppd[4932] Connection terminated.
2010-04-08 13:53:48 pcelena NetworkManager <info> VPN plugin failed: 1
2010-04-08 13:53:48 pcelena NetworkManager SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
2010-04-08 13:53:48 pcelena pppd[4932] Exit.
2010-04-08 13:53:48 pcelena NetworkManager <info> VPN plugin failed: 1
2010-04-08 13:53:48 pcelena NetworkManager <info> VPN plugin state changed: 6
2010-04-08 13:53:48 pcelena NetworkManager <info> VPN plugin state change reason: 0
2010-04-08 13:53:48 pcelena NetworkManager <WARN> connection_state_changed(): Could not process the request because no VPN connection was active.
2010-04-08 13:53:48 pcelena NetworkManager <info> Policy set 'Auto eth0' (eth0) as default for routing and DNS.
2010-04-08 13:54:01 pcelena NetworkManager <debug> [1270727641.001390] ensure_killed(): waiting for vpn service pid 4931 to exit
2010-04-08 13:54:01 pcelena NetworkManager <debug> [1270727641.001479] ensure_killed(): vpn service pid 4931 cleaned up
这里突出的错误是“pppd[4932] LCP 由对等端终止“。
有人对可能存在的问题以及如何解决它有什么建议吗？
答案1
我遇到了几乎完全相同的问题，下面是我解决问题的方法：
我启用了 128 位加密，并启用了所有其他选项。
现在它可以工作了！:)