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How to setup OpenVPN Server inside VirtualboxVM running Debian on Debian Host? At Guest System OpenVPN is running to tunnel all internet Traffic to another VPN-Server.

Now I want to setup an OpenVPN Server on that Guest System to get access on NFS running there. (NFS over VPN)

PS: Which Cipher to prefer to get best performance on Raspberry Pi VPN Client?

-- Initial OpenVPN Server Setup is up, and I can connect to VPN but no Traffic forwarded and no ICMP Pings. Ipv4 Forward in sysctl is enabled.

On Client Side Error:

Tue Jan  8 16:08:38 2019 /sbin/ip route add *SERVERIP*/32 via 192.168.188.1
RTNETLINK answers: File exists
Tue Jan  8 16:08:38 2019 ERROR: Linux route add command failed: external program exited with error status: 2
Tue Jan  8 16:08:38 2019 /sbin/ip route add 0.0.0.0/1 via 10.8.0.5
Tue Jan  8 16:08:38 2019 /sbin/ip route add 128.0.0.0/1 via 10.8.0.5
Tue Jan  8 16:08:38 2019 /sbin/ip route add 10.8.0.1/32 via 10.8.0.5

After Disconnect:

^CTue Jan  8 16:09:16 2019 event_wait : Interrupted system call (code=4)
Tue Jan  8 16:09:16 2019 /sbin/ip route del 10.8.0.1/32
RTNETLINK answers: Operation not permitted
Tue Jan  8 16:09:16 2019 ERROR: Linux route delete command failed: external program exited with error status: 2
Tue Jan  8 16:09:16 2019 /sbin/ip route del *SERVERIP*/32
RTNETLINK answers: Operation not permitted
Tue Jan  8 16:09:16 2019 ERROR: Linux route delete command failed: external program exited with error status: 2
Tue Jan  8 16:09:16 2019 /sbin/ip route del 0.0.0.0/1
RTNETLINK answers: Operation not permitted
Tue Jan  8 16:09:16 2019 ERROR: Linux route delete command failed: external program exited with error status: 2
Tue Jan  8 16:09:16 2019 /sbin/ip route del 128.0.0.0/1
RTNETLINK answers: Operation not permitted
Tue Jan  8 16:09:16 2019 ERROR: Linux route delete command failed: external program exited with error status: 2
Tue Jan  8 16:09:16 2019 Closing TUN/TAP interface
Tue Jan  8 16:09:16 2019 /sbin/ip addr del dev tun0 local 10.8.0.6 peer 10.8.0.5
RTNETLINK answers: Operation not permitted
Tue Jan  8 16:09:16 2019 Linux ip addr del failed: external program exited with error status: 2

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