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VPN PPTP se déconnecte après une période aléatoire

Je n'arrive pas à garder ma connexion VPN en vie. J'utilise Ubuntu 14.04 64bit sur un Toshiba Protege R30-A-17E.

La connexion VPN s'éteint après une période de temps aléatoire, que je l'utilise ou non. J'ai essayé quelques trucs que j'ai découverts ici ou sur certains forums mais ça ne cesse de baisser. J'ai essayé de désactiver n'importe quel type de compression et d'activer l'option "envoyer des paquets d'écho ppp". J'ai même essayé d'utiliser un adaptateur réseau USB Apple et toujours pas de chance.

Voici le contenu de mon syslog (grepé par -E "Réseau | pptp | pppd").

    Sep 23 10:56:35 IVO NetworkManager[765]: <info> Starting VPN service 'pptp'...
    Sep 23 10:56:35 IVO NetworkManager[765]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 20965
    Sep 23 10:56:35 IVO NetworkManager[765]: <info> VPN service 'pptp' appeared; activating connections
    Sep 23 10:56:35 IVO NetworkManager[765]: <info> VPN plugin state changed: starting (3)
    Sep 23 10:56:35 IVO NetworkManager[765]: <info> VPN connection 'WiseMetering' (Connect) reply received.
    Sep 23 10:56:35 IVO pppd[20969]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded.
    Sep 23 10:56:35 IVO pppd[20969]: pppd 2.4.5 started by root, uid 0
    Sep 23 10:56:35 IVO pppd[20969]: Using interface ppp0
    Sep 23 10:56:35 IVO pppd[20969]: Connect: ppp0 <--> /dev/pts/54
    Sep 23 10:56:35 IVO NetworkManager[765]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
    Sep 23 10:56:35 IVO NetworkManager[765]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
    Sep 23 10:56:35 IVO NetworkManager[765]: <warn> /sys/devices/virtual/net/ppp0: couldn't determine device driver; ignoring...
    Sep 23 10:56:35 IVO pptp[20972]: nm-pptp-service-20965 log[main:pptp.c:314]: The synchronous pptp option is NOT activated
    Sep 23 10:56:35 IVO pptp[20984]: nm-pptp-service-20965 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 'Start-Control-Connection-Request'
    Sep 23 10:56:35 IVO pptp[20984]: nm-pptp-service-20965 log[ctrlp_disp:pptp_ctrl.c:739]: Received Start Control Connection Reply
    Sep 23 10:56:35 IVO pptp[20984]: nm-pptp-service-20965 log[ctrlp_disp:pptp_ctrl.c:773]: Client connection established.
    Sep 23 10:56:36 IVO pptp[20984]: nm-pptp-service-20965 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'
    Sep 23 10:56:36 IVO pptp[20984]: nm-pptp-service-20965 log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
    Sep 23 10:56:36 IVO pptp[20984]: nm-pptp-service-20965 log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 0, peer's call ID 11648).
    Sep 23 10:56:39 IVO pppd[20969]: CHAP authentication succeeded
    Sep 23 10:56:39 IVO pppd[20969]: MPPE 128-bit stateless compression enabled
    Sep 23 10:56:41 IVO NetworkManager[765]: <info> (eth0): IP6 addrconf timed out or failed.
    Sep 23 10:56:41 IVO NetworkManager[765]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
    Sep 23 10:56:41 IVO NetworkManager[765]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) started...
    Sep 23 10:56:41 IVO NetworkManager[765]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
    Sep 23 10:56:41 IVO pppd[20969]: local  IP address 192.168.200.67
    Sep 23 10:56:41 IVO pppd[20969]: remote IP address 192.168.200.1
    Sep 23 10:56:41 IVO pppd[20969]: primary   DNS address 192.168.200.1
    Sep 23 10:56:41 IVO pppd[20969]: secondary DNS address 192.168.200.1
    Sep 23 10:56:41 IVO NetworkManager[765]: <info> VPN connection 'WiseMetering' (IP4 Config Get) reply received from old-style plugin.
    Sep 23 10:56:41 IVO NetworkManager[765]: <info> VPN Gateway: 194.38.128.63
    Sep 23 10:56:41 IVO NetworkManager[765]: <info> Tunnel Device: ppp0
    Sep 23 10:56:41 IVO NetworkManager[765]: <info> IPv4 configuration:
    Sep 23 10:56:41 IVO NetworkManager[765]: <info>   Internal Address: 192.168.200.67
    Sep 23 10:56:41 IVO NetworkManager[765]: <info>   Internal Prefix: 32
    Sep 23 10:56:41 IVO NetworkManager[765]: <info>   Internal Point-to-Point Address: 192.168.200.1
    Sep 23 10:56:41 IVO NetworkManager[765]: <info>   Maximum Segment Size (MSS): 0
    Sep 23 10:56:41 IVO NetworkManager[765]: <info>   Static Route: 192.168.200.0/24   Next Hop: 192.168.200.0
    Sep 23 10:56:41 IVO NetworkManager[765]: <info>   Static Route: 192.168.1.0/24   Next Hop: 192.168.1.0
    Sep 23 10:56:41 IVO NetworkManager[765]: <info>   Forbid Default Route: yes
    Sep 23 10:56:41 IVO NetworkManager[765]: <info>   Internal DNS: 192.168.200.1
    Sep 23 10:56:41 IVO NetworkManager[765]: <info>   DNS Domain: '(none)'
    Sep 23 10:56:41 IVO NetworkManager[765]: <info> No IPv6 configuration
    Sep 23 10:56:42 IVO NetworkManager[765]: <info> VPN connection 'WiseMetering' (IP Config Get) complete.
    Sep 23 10:56:42 IVO NetworkManager[765]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS.
    Sep 23 10:56:42 IVO NetworkManager[765]: <info> Writing DNS information to /sbin/resolvconf
    Sep 23 10:56:42 IVO NetworkManager[765]: <info> VPN plugin state changed: started (4)
    Sep 23 10:57:36 IVO pptp[20984]: nm-pptp-service-20965 log[logecho:pptp_ctrl.c:677]: Echo Reply received.
    Sep 23 11:06:37 IVO pptp[20984]: message repeated 9 times: [ nm-pptp-service-20965 log[logecho:pptp_ctrl.c:677]: Echo Reply received.]
    Sep 23 11:06:37 IVO pptp[20984]: nm-pptp-service-20965 log[logecho:pptp_ctrl.c:679]: no more Echo Reply/Request packets will be reported.
    Sep 23 11:17:37 IVO pptp[20984]: nm-pptp-service-20965 log[pptp_handle_timer:pptp_ctrl.c:1050]: closing control connection due to missing echo reply
    Sep 23 11:17:37 IVO pptp[20984]: nm-pptp-service-20965 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
    Sep 23 11:17:37 IVO pptp[20984]: nm-pptp-service-20965 log[pptp_conn_close:pptp_ctrl.c:430]: Closing PPTP connection
    Sep 23 11:17:37 IVO pptp[20984]: nm-pptp-service-20965 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 3 'Stop-Control-Connection-Request'
    Sep 23 11:17:37 IVO pptp[20984]: nm-pptp-service-20965 log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
    Sep 23 11:17:37 IVO pppd[20969]: Modem hangup
    Sep 23 11:17:37 IVO pppd[20969]: Connect time 21.0 minutes.
    Sep 23 11:17:37 IVO pppd[20969]: Sent 10793 bytes, received 9913 bytes.
    Sep 23 11:17:37 IVO pppd[20969]: MPPE disabled
    Sep 23 11:17:37 IVO pppd[20969]: Connection terminated.
    Sep 23 11:17:37 IVO NetworkManager[765]: <info> VPN plugin state changed: stopping (5)
    Sep 23 11:17:37 IVO NetworkManager[765]: <info> VPN plugin state changed: stopped (6)
    Sep 23 11:17:37 IVO NetworkManager[765]: <info> VPN plugin state change reason: 0
    Sep 23 11:17:37 IVO pppd[20969]: Exit.
    Sep 23 11:17:38 IVO NetworkManager[765]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS.
    Sep 23 11:17:38 IVO NetworkManager[765]: <info> Writing DNS information to /sbin/resolvconf
    Sep 23 11:17:38 IVO NetworkManager[765]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
    Sep 23 11:17:38 IVO NetworkManager[765]: <warn> (45) failed to find interface name for index
    Sep 23 11:17:38 IVO NetworkManager[765]: nm_system_iface_flush_routes: assertion 'iface != NULL' failed
    Sep 23 11:17:38 IVO NetworkManager[765]: <warn> (45) failed to find interface name for index
    Sep 23 11:17:38 IVO NetworkManager[765]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
    Sep 23 11:17:43 IVO NetworkManager[765]: <info> VPN service 'pptp' disappeared

Est-ce que quelqu'un a une idée de ce qui se passe ici?

EDIT

J'ai 2 ordinateurs portables différents, tous deux sous Ubuntu 14.04 64bits (en fait, l'un d'eux utilise Xubuntu, mais c'est fondamentalement la même chose).

Ces deux ordinateurs portables présentent exactement le même comportement lorsque le VPN se déconnecte de manière aléatoire après avoir enregistré quelque chose du type "fermeture de la connexion de contrôle en raison d'une réponse d'écho manquante" à syslog.

J'ai aussi un petit netbook sur lequel j'ai installé #! 11 (qui exécute toujours le noyau 3.2 btw). Avec exactement la même configuration, le VPN n’a pas été déconnecté depuis un peu plus de 10 heures et la seule raison pour laquelle il s’est déconnecté du VPN est parce que je le lui ai dit.

Alors .. est-ce que cela pourrait être un problème Ubuntu 14.04? ou un problème de noyau? ou un problème de version de lib?

networkingnetwork-managervpnpptp
1
Lynx_Eyes

Il est probable que le serveur VPN ne prend pas en charge certaines fonctionnalités de compression. Si le serveur est basé sur Windows, essayez de désactiver PPP l'envoi de paquets d'écho. Désactiver également la compression BSD, la compression Deflate et la compression d'en-tête TCP peut résoudre le problème. Si le problème persiste, l'erreur DNS peut en être la cause.

1
Rose Ab