็How i can config My openvpn client or server as static ip.

netusernoname

Hi all

I have a network that has 2 Windows based computers map drive between Wan by using OpenVPN.
My problem is when Client have to restart or shutting down and start up again then map drive that map from Server (OpenVPN Server) to Client (OpenVPN Client) could not reachable.
My Question is : how I can config my both Client and Server as
Server : 10.8.0.1
Client : 10.8.0.6

Thank in Advance