Как я получаю VPN PPTP, работающую от моей домашней сети, когда она уже работает в другом месте?

У меня есть ноутбук Dell Precision M6300 с установленной ubuntu 14.04 LTS, который я использую на работе для программного обеспечения Linux. Я работал из вспомогательной станции, и подключенный к главному офису с помощью VPN для забирания лицензии на программное обеспечение, и это хорошо работало.

Однако я действительно замечал, что каждый раз, когда я работал из дома (и по Ethernet и по беспроводной связи), этот ноутбук даст "соединению VPN отказавшее" сообщение. Я действительно находил обходное решение для этого, которое включило разъединение ноутбука от домашнего маршрутизатора, включение мобильная точка доступа по моему мобильному телефону, подключение ноутбука к мобильной точке доступа и создания соединения VPN по мобильному интернет-соединению, и это будет работать.

Таким образом, этот ноутбук человечности делает соединение VPN успешно из вспомогательной станции, по моему мобильному Интернету, и по нескольким другим местоположениям (дома других людей), но не соединяется в моей домашней сети (или на кабеле или на беспроводной связи). Я должен также упомянуть, что у меня также есть ноутбук работы Windows 7, который не имеет никаких проблем с тем же соединением VPN, даже из моего дома.

Я нахожусь в Великобритании, моим домашним ISP является Virgin Media, и маршрутизатор является "Супер Концентратором VMDG490".

Что я могу сделать, чтобы или диагностировать или решить проблему?

Когда я использую tail -f /var/log/syslog и попытайтесь соединиться от моей домашней сети (и я перестал работать), я получаю это:

Feb 22 17:27:46 VEC-ubuntu-precision-m6300 NetworkManager[764]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
Feb 22 17:27:52 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN service 'pptp' disappeared
Feb 22 17:28:18 VEC-ubuntu-precision-m6300 pptp[2399]: nm-pptp-service-2387 warn[open_inetsock:pptp_callmgr.c:329]: connect: Connection timed out
Feb 22 17:28:18 VEC-ubuntu-precision-m6300 pptp[2399]: nm-pptp-service-2387 fatal[callmgr_main:pptp_callmgr.c:127]: Could not open control connection to XX.XX.XX.XXX
Feb 22 17:28:18 VEC-ubuntu-precision-m6300 pptp[2396]: nm-pptp-service-2387 fatal[open_callmgr:pptp.c:487]: Call manager exited with error 256
Feb 22 17:29:05 VEC-ubuntu-precision-m6300 wpa_supplicant[802]: wlan0: CTRL-EVENT-SCAN-STARTED 
Feb 22 17:29:10 VEC-ubuntu-precision-m6300 wpa_supplicant[802]: nl80211: send_and_recv->nl_recvmsgs failed: -33
Feb 22 17:29:18 VEC-ubuntu-precision-m6300 pptp[2431]: nm-pptp-service-2422 warn[open_inetsock:pptp_callmgr.c:329]: connect: Connection timed out
Feb 22 17:29:18 VEC-ubuntu-precision-m6300 pptp[2431]: nm-pptp-service-2422 fatal[callmgr_main:pptp_callmgr.c:127]: Could not open control connection to XX.XX.XX.XXX
Feb 22 17:29:18 VEC-ubuntu-precision-m6300 pptp[2429]: nm-pptp-service-2422 fatal[open_callmgr:pptp.c:487]: Call manager exited with error 256
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Starting VPN service 'pptp'...
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 2463
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN service 'pptp' appeared; activating connections
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN plugin state changed: starting (3)
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN connection 'Vectayn' (Connect) reply received.
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 pppd[2467]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded.
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 pppd[2467]: pppd 2.4.5 started by root, uid 0
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 pppd[2467]: Using interface ppp0
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 pppd[2467]: Connect: ppp0 <--> /dev/pts/3
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 NetworkManager[764]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 NetworkManager[764]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 NetworkManager[764]: <warn> /sys/devices/virtual/net/ppp0: couldn't determine device driver; ignoring...
Feb 22 17:30:07 VEC-ubuntu-precision-m6300 pptp[2470]: nm-pptp-service-2463 log[main:pptp.c:314]: The synchronous pptp option is NOT activated
Feb 22 17:30:38 VEC-ubuntu-precision-m6300 pppd[2467]: LCP: timeout sending Config-Requests
Feb 22 17:30:38 VEC-ubuntu-precision-m6300 pppd[2467]: Connection terminated.
Feb 22 17:30:38 VEC-ubuntu-precision-m6300 NetworkManager[764]: <warn> VPN plugin failed: 1
Feb 22 17:30:38 VEC-ubuntu-precision-m6300 NetworkManager[764]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Feb 22 17:30:38 VEC-ubuntu-precision-m6300 pppd[2467]: Modem hangup
Feb 22 17:30:38 VEC-ubuntu-precision-m6300 NetworkManager[764]: <warn> VPN plugin failed: 1
Feb 22 17:30:43 VEC-ubuntu-precision-m6300 pppd[2467]: Exit.
Feb 22 17:30:43 VEC-ubuntu-precision-m6300 NetworkManager[764]: <warn> VPN plugin failed: 1
Feb 22 17:30:43 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN plugin state changed: stopped (6)
Feb 22 17:30:43 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN plugin state change reason: 0
Feb 22 17:30:43 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Policy set 'VM247013-2G' (wlan0) as default for IPv4 routing and DNS.
Feb 22 17:30:43 VEC-ubuntu-precision-m6300 NetworkManager[764]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
Feb 22 17:30:48 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN service 'pptp' disappeared

Когда я делаю то же по своей сети мобильной связи (и это работает), я получаю это:

Feb 22 17:46:40 VEC-ubuntu-precision-m6300 dnsmasq[1100]: setting upstream servers from DBus
Feb 22 17:46:40 VEC-ubuntu-precision-m6300 dnsmasq[1100]: using nameserver 192.168.43.1#53
Feb 22 17:46:40 VEC-ubuntu-precision-m6300 avahi-daemon[676]: Joining mDNS multicast group on interface wlan0.IPv6 with address aa80::21a:3aaa:aa12:aa99.
Feb 22 17:46:40 VEC-ubuntu-precision-m6300 avahi-daemon[676]: New relevant interface wlan0.IPv6 for mDNS.
Feb 22 17:46:40 VEC-ubuntu-precision-m6300 avahi-daemon[676]: Registering new address record for aa80::21a:3aaa:aa12:aa99 on wlan0.*.
Feb 22 17:46:40 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Activation (wlan0) successful, device activated.
Feb 22 17:46:40 VEC-ubuntu-precision-m6300 dbus[628]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Feb 22 17:46:40 VEC-ubuntu-precision-m6300 dbus[628]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Feb 22 17:46:40 VEC-ubuntu-precision-m6300 whoopsie[1015]: online
Feb 22 17:46:47 VEC-ubuntu-precision-m6300 ntpdate[2687]: adjust time server TT.TTT.TT.TTT offset 0.090452 sec
Feb 22 17:46:58 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> (wlan0): IP6 addrconf timed out or failed.
Feb 22 17:46:58 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
Feb 22 17:46:58 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) started...
Feb 22 17:46:58 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
Feb 22 17:47:08 VEC-ubuntu-precision-m6300 wpa_supplicant[802]: wlan0: CTRL-EVENT-SCAN-STARTED 
Feb 22 17:47:12 VEC-ubuntu-precision-m6300 wpa_supplicant[802]: nl80211: send_and_recv->nl_recvmsgs failed: -33
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Starting VPN service 'pptp'...
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 2710
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN service 'pptp' appeared; activating connections
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN plugin state changed: init (1)
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN plugin state changed: starting (3)
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN connection 'Vectayn' (Connect) reply received.
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 pppd[2714]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded.
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 pppd[2714]: pppd 2.4.5 started by root, uid 0
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 pppd[2714]: Using interface ppp0
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 pppd[2714]: Connect: ppp0 <--> /dev/pts/3
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 pptp[2717]: nm-pptp-service-2710 log[main:pptp.c:314]: The synchronous pptp option is NOT activated
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 NetworkManager[764]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 NetworkManager[764]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 NetworkManager[764]: <warn> /sys/devices/virtual/net/ppp0: couldn't determine device driver; ignoring...
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 pptp[2734]: nm-pptp-service-2710 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 'Start-Control-Connection-Request'
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 pptp[2734]: nm-pptp-service-2710 log[ctrlp_disp:pptp_ctrl.c:739]: Received Start Control Connection Reply
Feb 22 17:47:20 VEC-ubuntu-precision-m6300 pptp[2734]: nm-pptp-service-2710 log[ctrlp_disp:pptp_ctrl.c:773]: Client connection established.
Feb 22 17:47:21 VEC-ubuntu-precision-m6300 pptp[2734]: nm-pptp-service-2710 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'
Feb 22 17:47:21 VEC-ubuntu-precision-m6300 pptp[2734]: nm-pptp-service-2710 log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
Feb 22 17:47:21 VEC-ubuntu-precision-m6300 pptp[2734]: nm-pptp-service-2710 log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 0, peer's call ID 10015).
Feb 22 17:47:21 VEC-ubuntu-precision-m6300 pppd[2714]: CHAP authentication succeeded
Feb 22 17:47:21 VEC-ubuntu-precision-m6300 kernel: [ 1556.382975] PPP BSD Compression module registered
Feb 22 17:47:21 VEC-ubuntu-precision-m6300 kernel: [ 1556.397676] PPP Deflate Compression module registered
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 pppd[2714]: local  IP address L.LL.LLL.LLL
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 pppd[2714]: remote IP address R.RR.RRR.RR
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 pppd[2714]: primary   DNS address D.DD.DDD.DDD
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 pppd[2714]: secondary DNS address 8.8.8.8
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN connection 'Vectayn' (IP4 Config Get) reply received from old-style plugin.
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN Gateway: GG.GG.GG.GGG
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Tunnel Device: ppp0
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> IPv4 configuration:
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info>   Internal Address: L.LL.LLL.LLL
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info>   Internal Prefix: 32
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info>   Internal Point-to-Point Address: R.RR.RRR.RR
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info>   Maximum Segment Size (MSS): 0
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info>   Forbid Default Route: no
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info>   Internal DNS: D.DD.DDD.DDD
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info>   Internal DNS: 8.8.8.8
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info>   DNS Domain: '(none)'
Feb 22 17:47:22 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> No IPv6 configuration
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN connection 'Vectayn' (IP Config Get) complete.
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Policy set 'Vectayn' (ppp0) as default for IPv4 routing and DNS.
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> Writing DNS information to /sbin/resolvconf
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 dnsmasq[1100]: setting upstream servers from DBus
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 dnsmasq[1100]: using nameserver 8.8.8.8#53
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 dnsmasq[1100]: using nameserver D.DD.DDD.DDD#53
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 NetworkManager[764]: <info> VPN plugin state changed: started (4)
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 dbus[628]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 dbus[628]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 pptp[2734]: nm-pptp-service-2710 log[logecho:pptp_ctrl.c:677]: Echo Request received.
Feb 22 17:47:23 VEC-ubuntu-precision-m6300 pptp[2734]: nm-pptp-service-2710 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 6 'Echo-Reply'
Feb 22 17:47:31 VEC-ubuntu-precision-m6300 ntpdate[2789]: adjust time server TT.TTT.TT.TTT offset 0.069434 sec