August 2015
Intermediate to advanced
364 pages
7h 35m
English
Content preview from Mastering OpenVPNBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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OpenVPN internals
The design of OpenVPN is not extensively documented, but most of the internals of OpenVPN can be discovered by looking at the source code.
The tun/tap driver
One of the basic building blocks of OpenVPN is the tun/tap driver. The concept of the tun/tap driver comes from the Unix/Linux world, where it is often natively available as part of the operating system. This is a virtual network adapter that is treated by the operating system as either a point-to-point adapter (tun-style) for IP-only traffic or as a full virtual Ethernet adapter for all types of traffic (tap-style). At the backend of this adapter is an application, such as OpenVPN, to process the incoming and outgoing traffic. Linux, Free/Open/NetBSD, Solaris and Mac OS include ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.