我刚刚在Debian 6.0上安装了OpenSwan，并根据本教程进行configuration： http ://confoundedtech.blogspot.co.uk/2011/08/android-nexus-one-ipsec-psk-vpn-with.html许多类似的文件，即使我改变了一些参数，当我尝试使用L2TP作为VPN客户端连接Iphone时，我总是以xl2tpd的错误结束：
Apr 22 16:31:25 debian xl2tpd[19713]: network_thread: recv packet from 212.183.140.62, size = 476, tunnel = 32857, call = 10067 ref=0 refhim=0 Apr 22 16:31:25 debian xl2tpd[19713]: network_thread: unable to find call or tunnel to handle packet. call = 10067, tunnel = 32857 Dumping. Apr 22 16:37:52 debian xl2tpd[19713]: network_thread: recv packet from 212.183.140.62, size = 476, tunnel = 33015, call = 50076 ref=0 refhim=0 Apr 22 16:37:52 debian xl2tpd[19713]: network_thread: unable to find call or tunnel to handle packet. call = 50076, tunnel = 33015 Dumping. Apr 22 16:37:54 debian xl2tpd[19713]: network_thread: recv packet from 212.183.140.62, size = 476, tunnel = 33015, call = 50076 ref=0 refhim=0 Apr 22 16:37:54 debian xl2tpd[19713]: network_thread: unable to find call or tunnel to handle packet. call = 50076, tunnel = 33015 Dumping. Apr 22 16:37:57 debian xl2tpd[19713]: network_thread: recv packet from 212.183.140.62, size = 476, tunnel = 33015, call = 50076 ref=0 refhim=0 Apr 22 16:37:57 debian xl2tpd[19713]: network_thread: unable to find call or tunnel to handle packet. call = 50076, tunnel = 33015 Dumping. Apr 22 16:38:00 debian xl2tpd[19713]: network_thread: recv packet from 212.183.140.62, size = 476, tunnel = 33015, call = 50076 ref=0 refhim=0 Apr 22 16:38:00 debian xl2tpd[19713]: network_thread: unable to find call or tunnel to handle packet. call = 50076, tunnel = 33015 Dumping. 这是我的xl2tpdconfiguration：
[global] listen-addr=192.168.0.148 port=1701 debug tunnel=yes debug avp=yes debug packet=yes debug network=yes debug state=yes [lns default] ip range = 192.168.0.220-192.168.0.230 local ip = 192.168.0.148 require chap = yes require authentication = yes refuse pap = yes ppp debug = yes length bit = yes pppoptfile = /etc/xl2tpd/ppp-options.xl2tpd
这是我的ppt-options.xl2tpd文件：
ipcp-accept-local ipcp-accept-remote noccp auth #crtscts idle 1800 mtu 1410 mru 1410 nodefaultroute debug lock proxyarp connect-delay 5000 ms-dns 192.168.0.1 #name l2tpd #lcp-echo-interval 30 #lcp-echo-failure 4 logfile /var/log/ppp.log
这让我很生气，我在这里错过了什么？
listen-addr不应该与本地ip相同。
listen-addr – 是连接到LAN / WAN的主机的物理地址本地ip – 是与虚拟networking连接的隧道主机的虚拟地址
设置两个相同的可能是你的隧道问题的根源，