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Bohužel nemohu. Komunikace s protistranou v tomto stylu by u nich zřejmě zapříčinila dotazy ve smyslu, proč se snažím připojit z linuxu, když se mám připojovat z Windows, kde jedině běží aplikace, která tuto VPN používá.

Každopádně jsem trochu pokročil. Nakonec jsem převzal konfiguraci co nějakým způsobem fungovala v NetworkManageru.

IPSec spojení tedy navážu. Toto je fungující konfigurace.

conn test
        auto=add
        type=transport
        authby=secret
        keyingtries=0
        left=%defaultroute
        leftprotoport=udp/l2tp
        right=X.X.X.X
        rightid=%any
        rightprotoport=udp/l2tp
        pfs=no
        ike=aes-sha1;modp1024

Následně i úspěšně navážu spojeni přes L2TP. Problém ovšem je stejný jak jsem již psal dříve a to sice, že spojení je vždy po cca 1,5 minutě ukončeno.

Nov 25 18:52:35 localhost pppd[2020]: pppd 2.4.5 started by root, uid 0
Nov 25 18:52:35 localhost pppd[2020]: Using interface ppp0
Nov 25 18:52:35 localhost pppd[2020]: Connect: ppp0 <-->
Nov 25 18:52:35 localhost pppd[2020]: Overriding mtu 1500 to 1410
Nov 25 18:52:35 localhost pppd[2020]: Overriding mru 1500 to mtu value 1410
Nov 25 18:52:35 localhost NetworkManager[644]: -info-  [1511632355.5976] manager: (ppp0): new Generic device (/org/freedesktop/NetworkManager/Devices/4)
Nov 25 18:52:35 localhost pppd[2020]: Overriding mtu 1500 to 1410
Nov 25 18:52:35 localhost pppd[2020]: Overriding mru 1500 to mtu value 1410
Nov 25 18:52:37 localhost pppd[2020]: PAP authentication succeeded
Nov 25 18:52:37 localhost pppd[2020]: not replacing existing default route via 192.168.62.1
Nov 25 18:52:37 localhost pppd[2020]: local  IP address 192.168.155.97
Nov 25 18:52:37 localhost pppd[2020]: remote IP address X.X.X.X
Nov 25 18:54:06 localhost xl2tpd: xl2tpd[961]: Maximum retries exceeded for tunnel 54485.  Closing.
Nov 25 18:54:06 localhost xl2tpd: xl2tpd[961]: Connection 1088 closed to X.X.X.X, port 1701 (Timeout)
Nov 25 18:54:06 localhost pppd[2020]: Terminating on signal 15
Nov 25 18:54:06 localhost pppd[2020]: Connect time 1.5 minutes.
Nov 25 18:54:06 localhost pppd[2020]: Sent 143851 bytes, received 0 bytes.
Nov 25 18:54:06 localhost pppd[2020]: Overriding mtu 1500 to 1410
Nov 25 18:54:06 localhost pppd[2020]: Overriding mru 1500 to mtu value 1410
Nov 25 18:54:06 localhost pppd[2020]: Connection terminated.
Nov 25 18:54:06 localhost pppd[2020]: Exit.

Podrobněji pak

...
Nov 25 20:49:14 localhost pppd[5503]: PAP authentication succeeded
Nov 25 20:49:14 localhost pppd[5503]: not replacing existing default route via 192.168.62.1
Nov 25 20:49:14 localhost pppd[5503]: local  IP address 192.168.155.97
Nov 25 20:49:14 localhost pppd[5503]: remote IP address X.X.X.X
Nov 25 20:50:12 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:50:13 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:50:15 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:50:19 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:50:27 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:50:42 localhost systemd-logind: Removed session 1.
Nov 25 20:50:43 localhost pppd[5503]: Terminating on signal 15
Nov 25 20:50:43 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:50:43 localhost xl2tpd: xl2tpd[5487]: Maximum retries exceeded for tunnel 61851.  Closing.
Nov 25 20:50:43 localhost xl2tpd: xl2tpd[5487]: Connection 1096 closed to X.X.X.X, port 1701 (Timeout)
Nov 25 20:50:43 localhost pppd[5503]: Connect time 1.5 minutes.
Nov 25 20:50:43 localhost pppd[5503]: Sent 372409 bytes, received 0 bytes.
Nov 25 20:50:43 localhost pppd[5503]: Overriding mtu 1500 to 1410
Nov 25 20:50:43 localhost pppd[5503]: Overriding mru 1500 to mtu value 1410
Nov 25 20:50:43 localhost pppd[5503]: Connection terminated.
Nov 25 20:50:43 localhost xl2tpd: xl2tpd[5487]: network_thread: select returned error 4 (Interrupted system call)
Nov 25 20:50:43 localhost pppd[5503]: Exit.
Nov 25 20:50:44 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:50:46 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:50:50 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:50:58 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:51:14 localhost xl2tpd: xl2tpd[5487]: network_thread: select timeout
Nov 25 20:51:14 localhost xl2tpd: xl2tpd[5487]: Unable to deliver closing message for tunnel 61851. Destroying anyway.
Nov 25 20:51:14 localhost xl2tpd: xl2tpd[5487]: network_thread: select returned error 9 (Bad file descriptor)

Navíc když je takto spojení ukončeno, tak se občas objevují další hlášky podobné této. Což jestli dobře chápu, tak server tunelem přijímá data pro spojení, které ale před tím již ukončil.

Nov 25 20:53:12 localhost xl2tpd: xl2tpd[5487]: network_thread: unable to find call or tunnel to handle packet.  call = 0, tunnel = 61851 Dumping.
Nov 25 20:53:15 localhost xl2tpd: xl2tpd[5487]: network_thread: recv packet from X.X.X.X, size = 20, tunnel = 61851, call = 0 ref=0 refhim=0
Nov 25 20:53:15 localhost xl2tpd: xl2tpd[5487]: Can not find tunnel 61851 (refhim=0)

Neví někdo, kde by mohl být problém? Už se mi zdá, že jsem prohledal celý internet a nikde jsem podobný problém nenašel.