Если вы надумали конектиться к PPTP(VPN)-серверу, а сами сидите за NATом, то обязательно позаботтесь о том, чтобы на сервере(если он под Linux) был загружен модуль ядра ip_nat_pptp.

modprobe ip_nat_pptp

иначе vpn будет вываливаться примерно в вот такое:

May 20 23:06:18 darkstar pppd[5093]: pppd 2.4.4 started by root, uid 0
May 20 23:06:19 darkstar pppd[5093]: Using interface ppp0
May 20 23:06:20 darkstar pppd[5093]: Connect: ppp0 <–> /dev/pts/6
May 20 23:06:20 darkstar pptp[5094]: anon log[main:pptp.c:314]: The synchronous pptp option is NOT activated
May 20 23:06:20 darkstar pptp[5105]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 ‘Start-Control-Connection-Request’
May 20 23:06:20 darkstar pptp[5105]: anon log[ctrlp_disp:pptp_ctrl.c:739]: Received Start Control Connection Reply
May 20 23:06:20 darkstar pptp[5105]: anon log[ctrlp_disp:pptp_ctrl.c:773]: Client connection established.
May 20 23:06:20 darkstar pptp[5105]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 ‘Outgoing-Call-Request’
May 20 23:06:20 darkstar pptp[5105]: anon log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
May 20 23:06:20 darkstar pptp[5105]: anon log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 0, peer’s call ID 10624).
May 20 23:06:20 darkstar pptp[5105]: anon log[pptp_read_some:pptp_ctrl.c:544]: read returned zero, peer has closed
May 20 23:06:20 darkstar pptp[5105]: anon log[callmgr_main:pptp_callmgr.c:258]: Closing connection (shutdown)
May 20 23:06:20 darkstar pptp[5105]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 ‘Call-Clear-Request’
May 20 23:06:20 darkstar pppd[5093]: Modem hangup
May 20 23:06:20 darkstar pppd[5093]: Connection terminated.
May 20 23:06:20 darkstar pptp[5105]: anon log[pptp_read_some:pptp_ctrl.c:544]: read returned zero, peer has closed
May 20 23:06:20 darkstar pptp[5105]: anon log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
May 20 23:06:20 darkstar pppd[5093]: Exit.

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