A Virtual Private Network is a way to connect one ore more private networks using a wide public network such as internet and using different tunneling and security protocols such as SSL (Secure Socket Layer), IPsec and others.
OpenVPN is a free and open source implementation of a SSL VPN, which uses extensions OSI layer 2 or 3 to secure networks that use the protocols SSL / TLS, it supports various media such as certificates of authentication, smart cards, and / or users / passwords, and allows policies Access control for usaurios or groups using firewall rules applied to the virtual interfaces of the VPN. OpenVPN 2.0 allows multiple customers to connect to a single server (process) OpenVPN on a simple TCP or UDP port.
To ensure safe connections, OpenVPN has a system of users authentication and data encryption. Besides send the data in this way, the program ensures that the information has not been tampered with during transfer.
Ultimately, it is a tool for network administrators, not too easy to drive, but safe and effective.
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