Well it's not that easy...
I did as you said, and startet the *ovpn from my provider.
There appeared a new device tun0 until next reboot
eth0 Link encap:Ethernet HWaddr F8:32:E4:75:47:B4
inet addr:192.168.178.3 Bcast:192.168.178.255 Mask:255.255.255.0
inet6 addr: 2003:c5:bf13:bf00:fa32:e4ff:fe75:47b4/64 Scope:Global
inet6 addr: fe80::fa32:e4ff:fe75:47b4/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:28076 errors:0 dropped:12022 overruns:0 frame:0
TX packets:5567 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:7386228 (7.0 MiB) TX bytes:1949078 (1.8 MiB)
Memory:df100000-df11ffff
eth1 Link encap:Ethernet HWaddr F8:32:E4:75:47:B5
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:16 Memory:df700000-df720000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:17639 errors:0 dropped:0 overruns:0 frame:0
TX packets:17639 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:128261705 (122.3 MiB) TX bytes:128261705 (122.3 MiB)
tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:10.200.0.102 P-t-P:10.200.0.101 Mask:255.255.255.255
inet6 addr: fe80::7f5d:978d:ab01:9903/64 Scope:Link
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:22 errors:0 dropped:0 overruns:0 frame:0
TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:3010 (2.9 KiB) TX bytes:2096 (2.0 KiB)
I then tried to upload the openvpn file via mld-webportal. It seemed to work.
the ovpn file in /etc/openvpn was deleted then... (?). I do not know what happend, but it is gone!
After a reboot, I think, tun0 seems gone. and I supose i surf without vpn.
How can I see me external IP?
curl ifconfig.me is not working, since I cannot install curl
BTW: But I have noticed that in etc/network/if-down.d and if-up.de I have a file "openvpn"
So, I really do not know if after rebbot I am connected, and if not, how I make the changes persistent.
Thaks for your help
Edit: I could identify me external IP with: wget -O - -q
https://api.ipify.org => I was not connected to vpn after reboot!