Ubuntu Server 10.10 / openswan 2.6.31 / l2tp无法链接

[AntiGameZ]

今天把Linode上面的9.04做掉上10.10。基本按照apple4us的这篇教程操作：https://apple4.us/2010/05/setting-up-l2tp-vpn-on-debian-ubuntu.html

openswan无论是走apt装还是编译安装都试过了，但是目前client怎么都连不上。从Windows上看反馈的信息是错误789。iPhone直接提示无法连接到PPP

看了下/var/log/message，有如下提示

https://gist.github.com/670355

不知道从哪里查起，各个服务的启动都是OK的。

[AntiGameZ]

Nov 10 04:01:20 li92-175 pppd[13130]: pppd 2.4.5 started by root, uid 0
Nov 10 04:01:20 li92-175 pppd[13130]: Using interface ppp0
Nov 10 04:01:20 li92-175 pppd[13130]: Connect: ppp0 <--> /dev/pts/1
Nov 10 04:01:21 li92-175 pppd[13130]: Unsupported protocol 'IPv6 Control Protovol' (0x8057) received
Nov 10 04:02:28 li92-175 pppd[13130]: LCP terminated by peer (No network protocols running)
Nov 10 04:02:31 li92-175 pppd[13130]: Connection terminated.
Nov 10 04:02:31 li92-175 pppd[13130]: Connect time 1.2 minutes.
Nov 10 04:02:31 li92-175 pppd[13130]: Sent 3827 bytes, received 6880 bytes.
Nov 10 04:02:31 li92-175 pppd[13130]: Modem hangup
Nov 10 04:02:31 li92-175 pppd[13130]: Exit.