Роутер DIR-300 рвет соединение

Здравствуйте, помогите, роутер рвет vpn соединение.
Настройки брал из этой инструкции www.progress-sb.ru/Stati/3g-internet-bez-videlennogo-ip.html
Соединение на несколько секунд устанавливается, потом исчезает.
Фрагмент лога роутера:
7]: Connect: ppp0 <--> /dev/pts/0
Feb 26 19:42:48 pppd[7053]: pppd 2.4.4 started by admin, uid 0
Feb 26 19:42:48 pppd[7053]: Connect: ppp0 <--> /dev/pts/2
Feb 26 19:42:52 pptp[6814]: anon log[logecho:pptp_ctrl.c:677]: Echo Request received.
Feb 26 19:42:52 pptp[6814]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 6 'Echo-Reply'
Feb 26 19:42:56 miniupnpd[1795]: remove port mapping 23070 TCP because it has expired
Feb 26 19:42:56 miniupnpd[1795]: remove port mapping 23070 UDP because it has expired
Feb 26 19:43:00 pptp[7026]: anon log[main:pptp.c:331]: The synchronous pptp option is NOT activated
Feb 26 19:43:00 pptp[6814]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'
Feb 26 19:43:00 pptp[6814]: anon log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
Feb 26 19:43:00 pptp[6814]: anon log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 2, peer's call ID 56968).
Feb 26 19:43:09 pptp[7055]: anon log[main:pptp.c:331]: The synchronous pptp option is NOT activated
Feb 26 19:43:09 pptp[6814]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'
Feb 26 19:43:09 pptp[6814]: anon log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
Feb 26 19:43:09 pptp[6814]: anon log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 3, peer's call ID 32755).
Feb 26 19:43:11 pppd[1547]: LCP: timeout sending Config-Requests
Feb 26 19:43:11 pppd[1547]: Connection terminated.
Feb 26 19:43:11 pppd[1547]: Modem hangup
Feb 26 19:43:11 pptp[7026]: anon warn[decaps_hdlc:pptp_gre.c:204]: short read (-1): Input/output error
Feb 26 19:43:11 pptp[7026]: anon warn[decaps_hdlc:pptp_gre.c:216]: pppd may have shutdown, see pppd log
Feb 26 19:43:11 pptp[6814]: anon log[callmgr_main:pptp_callmgr.c:234]: Closing connection (unhandled)
Feb 26 19:43:11 pptp[6814]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
Feb 26 19:43:11 pptp[6814]: anon log[ctrlp_disp:pptp_ctrl.c:929]: Call disconnect notification received (call id 3)
Feb 26 19:43:11 pptp[6814]: anon log[ctrlp_error:pptp_ctrl.c:199]: Result code is 0 'Unknown Result Code'. Error code is 0, Cause code is 0
Feb 26 19:43:11 pptp[6814]: anon log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
Feb 26 19:43:11 pppd[7053]: Modem hangup
Feb 26 19:43:11 pppd[7053]: Connection terminated.
Feb 26 19:43:11 pppd[7053]: Connection terminated.
Feb 26 19:43:16 pppd[1547]: Connect: ppp0 <--> /dev/pts/0
4:28 pppd[1514]: LCP: timeout sending Config-Requests
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Помогите, в чем может быть причина?