I have a rather special configuration, but I know it's doable with OpenVPN and Linux, but don't know how
.I have an OpenVPN Server (OpenVPN AS) running on the public internet with fixed IP.
I have one OpenWRT Client connected to this server
I have one Windows Client connected to this Server
The OpenVPN Subnet is e.g. 172.20.20.0/24
My OpenWRT Client has a 192.168.0.0/24 Subnet on the LAN side
My Windows Client has an IP Adress of a 192.168.1.0/24
I have one device behind my OpenWRT Client ( e.g. 192.168.0.100 ) which I would like to access from my Windows Client.
but I don't want to route the trafic, that means I don't want to have a static route on my Windows PC.
I know that there is an option to get another OpenVPN IP Address of the Subnet range, and this IP Address is just (I think) a static NAT to the device on the OpenWRT Client side.
For Example:
172.20.20.1 = OpenVPN IP of OpenWRT device
172.20.20.2 = "virtual" IP with static NAT to 192.168.0.100 (device on the LAN side of OpenWRT)
172.20.20.10 = OpenVPN IP of Windows device
So I should be able to access the device on the LAN side of OpenWRT with the OpenVPN IP address of 172.20.20.2.
But how am I able to set this up? I think I need to add that static NAT manually to my OpenWRT device, but how am I able to tell the OpenVPN Server, that my OpenWRT client has a second IP Address?
Thanks in advance!
Manuel