Openvpn tun opened but not used

bobaxx

Hi,

i set up an openvpn tunnel between my synology nas DS112, last DSM version (server side) and my remote vps (ovh - client side) under ubuntu server 18.04LTS

here are configuration files :

client side :

dev tun
tls-client
remote xx.xx.xx.xx 1194
pull
proto tcp-client
script-security 2
comp-lzo
reneg-sec 0
cipher AES-256-CBC
auth SHA512
auth-user-pass syno.cred
auth-nocache

(at end of that configuration file are set 2 ca i didnt post, this entire file come from an .ovpn export from my synology)

the server side is automated with the vpn packet on synology

the tunnel seems to be ok (TUN TAP device tun0 opened) on client side, and the synology detects the connected client.

but when i ping the other side 10.0.0.5 (nas) with the ubuntu server (10.0.0.6), it doesnt work.
i mount a distant folder of my nas from ubuntu server and transfer some files to test that, it works but, rx et tx packet goes through the public ip and doesnt seems to use the tunnel.

the command "route" from client side is like that :

Destination Gateway Genmask Flags Metric Ref Use Iface
default "OVH_GW_IP" 0.0.0.0 UG 100 0 0 ens3
10.0.0.0 10.0.0.5 255.255.255.0 UG 0 0 0 tun0
10.0.0.1 10.0.0.5 255.255.255.255 UGH 0 0 0 tun0
10.0.0.5 0.0.0.0 255.255.255.255 UH 0 0 0 tun0
"OVH_GW_IP" 0.0.0.0 255.255.255.255 UH 100 0 0 ens3
192.168.0.0 10.0.0.5 255.255.255.0 UG 0 0 0 tun0

edit : i can ping the vps (10.0.0.6) from my nas (seems to have 10.0.0.1 ip, and not 10.0.0.5 ip) via the tunnel , rx and tx packets on tun0 interface are updating in real time in this case

TinCanTech

bobaxx wrote i mount a distant folder of my nas from ubuntu server and transfer some files to test that, it works but, rx et tx packet goes through the public ip and doesnt seems to use the tunnel.

According to your route table, you will use the VPN to mount a folder on 10.0.0.0/24 network.

Please see:
https://forums.openvpn.net/viewtopic.php?f=30&t=22603#p68963