IP conflicts with local and remote LAN

Joseph22

Hello,
I have set up an OpenVPN and encounter some problems. Here is my architecture:

OpenVPN-Server has the IP 192.168.178.10/24 and the OpenVPN space is 172.17.10.0/24.

The UDP port 1194 is forwarded in my FritzBox. Additionally, there is RDP enabled on the server. This is also forwarded by the FritzBox.

Now I cannot connect to OpenVPN or RDP using the FritzBox public IP when I am in my home LAN (which has 192.168.178.67). If I turn on my mobile Hotspot, it works perfectly (IP is something of 10.X.X.X).

Is it necessary to reconfigure my remote LAN to use a different net? And can this problem occur if the OpenVPN server is not running, because I encounter this problem if the VPN server is running and if it is not.

Thanks a lot!

TinCanTech

Joseph22 wrote OpenVPN-Server has the IP 192.168.178.10/24

..

Now I cannot connect to OpenVPN or RDP using the FritzBox public IP when I am in my home LAN (which has 192.168.178.67).

So your server is in your home on the same LAN as your client.

This means your FritzBox does not support hairpinning

Joseph22

I think so.

Remote LAN: 192.168.178.0/24
VPN Server: 172.17.10.0/24
Local LAN: 192.168.178.0/24

So I Need to reconfigure my remote LAN?

Pippin

Yes,
https://community.openvpn.net/openvpn/wiki/AvoidRoutingConflicts

Joseph22

Thanks a lot, I already feared that 😃