We need a VPN service deployed on our dedicated server.
The VPN service will be offered to the customers on the subscription basis. Each customer will have a dedicated IP address on this server and TUP/TAP service for use. The server has 4x /24 IP subnetworks. The OS is Lunux (Debian, Ubuntu, or CentOS - per your choice, but we prefer Debian).
We need someone who can offer and deploy the optimum solution for this service. It can come with the billing panel or not (it is not important), but preferably it should have a Web interface for easy administration (control the users and enable/disable the service per user).