I have a raspberry box running an OpenVPN server that I'm using as a way to connect to use my Pihole installation when outside my home network. This is working without issues.
| HOME NETWORK/Pihole | (Remote client) -- (Open VPN Server ) --- Internet
Separately I have a remote VPN service that I can connect to via an OpenVPN client from the Pi device. That I tested successfully as well.
| HOME NETWORK/Pihole | (Open VPN Client ) - VPN provider
I would like to be combine both services such that the final installation would look like this
| HOME NETWORK /Pihole | (Remote client) -- (Open VPN Server) -- (Open VPN Client) --- Remote VPN service
I have tried solutions like the one described in this similar question (Wireguard server with active OpenVPN client) with negative similar results: Once you activate the Open VPN client (tun1) the server (tun0) becomes unreachable.
Here's what the routing table looks like when both interfaces tun are up
0.0.0.0/1 via 10.50.11.5 dev tun1 default via 192.168.1.1 dev wlan0 src 192.168.1.164 metric 303 10.8.0.0/24 dev tun0 proto kernel scope link src 10.8.0.1 10.50.11.1 via 10.50.11.5 dev tun1 10.50.11.5 dev tun1 proto kernel scope link src 10.50.11.6 220.127.116.11/1 via 10.50.11.5 dev tun1 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.164 metric 303 18.104.22.168 via 192.168.1.1 dev wlan0
Here's the current output of my openvpn server when I try to connect.
pi@raspberrypi:/etc/openvpn $ sudo more openvpn-status.log OpenVPN CLIENT LIST Updated,Sat Jun 29 23:30:41 2019 Common Name,Real Address,Bytes Received,Bytes Sent,Connected Since UNDEF,x.x.x.x:39159,860,442,Sat Jun 29 23:30:02 2019
This is what the error log looks like
Sat Jun 29 23:34:47 2019 x.x.x.x:28162 TLS Error: incoming packet authentication failed from [AF_INET]22.214.171.124:28162 Sat Jun 29 23:34:48 2019 x.x.x.x:28162 Authenticate/Decrypt packet error: bad packet ID (may be a replay): [ #1 / time = (1561869285) Sat Jun 29 23:34:45 2019 ] -- see the man page entry for --no-replay and --replay-window for more info or silence this warning with --mute-replay-warnings Sat Jun 29 23:34:48 2019 x.x.x.x:28162 TLS Error: incoming packet authentication failed from [AF_INET]x.x.x.x:28162
Apparently the client connection is getting corrupted?
I also tried the solution in OpenVPN Client and Server on same machine - Server doesn't allow connections when client is connected which I discovered after posting this question, to no avail. This would appear to be directly related to my issue but it's still not working.