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OpenVPN is a opensourse Software to establish virtual private network(VPN) via encrypted TLS connections. It provides a secure and encrypted user data communication between different hosts and networks.
The following step by step instruction will guide you through a OpenVPN configuration. So basically OpenVPN does have two different modes:
Bridge mode (TAP):
Advantages
Disadvantages
Routing Mode (TUN)
Advantages
Disadvantages
For this configuration we will use the most common mode, the routing mode.
See openvpn.pdf