@iorx:
By using NAT on the the routed OpenVPN connection, all client OpenVPN clients will originate from the the same, accepted IP, address. It's a solution, but I would like to see that each client poses with a unique IP (They've got some medical software which backtracks the clients IP and connects back to the client)
You can use outbound NAT to translate a whole subnet. So you can get a unique IP for each client as well.
E.g. the VPN tunnel network is 10.10.10.224/27, outbound NAT can translate it to 1.1.1.224/27. To wit 10.10.10.228 will be translated to 1.1.1.228 , 10.10.10.229 to 1.1.1.229 and so on.
What's the problem with this???