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How to Install and Configure OpenVPN Server with Linux and Windows Clients in RHEL/CentOS 7

In this article we will explain how to set up a VPN server in a RHEL/CentOS 7 box using OpenVPN, a robust and highly flexible tunneling application that uses the encryption, authentication, and certification features of the OpenSSL library. For simplicity we will only consider a case where the OpenVPN server acts as a secure Internet gateway for a client.