IP address visibility when connecting through a VPN

Question

Client is connecting to Host A using OpenVPN.

• Client can now reach Host B (Routes created on Client machine by OpenVPN client)
• Host B can now reach Client (Routes manually created on Host B)

When Client does an HTTP request to Host B, Host B sees Host As IP address. This is normal and how the VPN should work.

How can I port forward from Host A to Client, so that Host B does not need to know Host As address?

Answer 1

Without using OpenVPN myself, I would say the VPN machine is using NAT and though hiding the client IP addresses.

This link may explane how to do it.