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Beginning OpenVPN 2.0.9 by Norbert Graf, Markus Feilner

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Networking with OpenVPN

The modular structure of OpenVPN can not only be found in its security model, but also in the networking scheme. James Yonan chose the Universal TUN/TAP driver for the networking layer of OpenVPN.

The TUN/TAP driver is an open source project that is included in all modern Linux/Unix distributions, as well as Windows, Solaris, and Mac OS X. Like SSL/TLS, it is used in many projects, and therefore it is steadily being improved, and new features are being added. Using the TUN/TAP devices takes away a lot of complexity from the structure of OpenVPN. Its simple structure brings increased security when compared to other VPN solutions. Complexity is always the main enemy of security. For example, IPsec has a complex structure ...

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