VPN (Virtual Private Network) technology provides a secure and encrypted tunnel across a public network. So, a private network user can send and receive data to any remote private network through VPN tunnel as if his/her network device was directly connected to that private network.
Using OpenVPN it is also possible to forward IP-address range from one provider to another, from one country to another. The main advantage is securing the IP-address range even in case when you change a provider. Currently, due to depletion of IPv4 addresses, the above possibility is the almost sole one to obtain a provider-independent address range.
In this tutorial we are looking at how to forward a public or static IP address from an openVPN Tunnel. From the diagram above the we will observe two routers with different configurations: one is coming from the ISP end while the one to access from is in our office.
First of all we establish a connectivity between our two routers so that we are sure that we are able to route to our service providers gateway.
Second thing we need to do, is to configure network address translation on the router in the office, using our LAN parameters. This configuration depends on the router Model and make.
Lastly we have to put the device we will use on the same network with the router configuration by assigning a simple IP as above.
Finally the service providers must have done their configuration from their end and then you will be able to VPN in an open Tunnel.