I'm having a similar problem to this:
OpenVPN without NAT
Seems it wasn't answered yet.
Description of my situation:
I have an openvpn server on network A which another admin installed before he left the company, now several users and servers connect to that openvpn server to access network A and get NATed so all requests from vpn users/servers have the source address from the openvpn server.
Now I need a server on network A to access one of the openvpn clients/servers and want to disable NAT in openvpn to expose the "vpn internal" IP addresses of these clients and servers.
I know that I need to add a route on Network A to access the vpn network, that's clear to me but I cannot see how to disable NAT in openvpn, also there are no IPtables rules present so some openvpn internal NAT mechanism seems to be in use.
Which options I need to check to disable NAT?