Learn how to build a secure VPN using a powerful Open Source application Learn how to install, configure, and create tunnels with OpenVPN on Linux, Windows, and MacOSX Use OpenVPN with DHCP, routers, firewalls, and HTTP proxy servers security certificate Advanced management In Detail Strong OpenVPN, an open source SSL VPN application. After introducing the basics of security and VPN, the book moves on to cover using OpenVPN, from installing it on various platforms, through configuring basic tunnels, to the features of more advanced, such as using the application with firewalls, routers, proxy servers, and OpenVPN scripting. This chapter also covers some essential networking concepts. Chapter 2 describes the VPN security issues, including symmetric and asymmetric encryption, SSL / TLS library, and SSL certificates. In this chapter, we learn about the history of OpenVPN, how OpenVPN works, and how OpenVPN compared to IPSec VPN applications. Chapter 4 covers installing OpenVPN on Windows, Mac, Linux, and FreeBSD. Installation on Suse and Debian is discussed in detail. In Chapter 5, the encryption key for OpenVPN is created and is then used to set up our first OpenVPN Tunnel between two windows systems on the same network. The key is then copied on a Linux system and the system is connected via tunnel to the first windows machine. Chapter 6 shows how to create x509 server and client certificates for use with OpenVPN. Chapter 7 reviews the syntax of the command line tool openvpn, which enables building tunnels quickly. Then covers how to configure firewalls on Linux and Windows to work with OpenVPN. Chapter 9 focuses on using xca, advanced Windows tool with which x509 certificates can be easily managed. Chapter 10 covers advanced OpenVPN configurations, including Tunneling through a proxy server, pushing routing commands to clients, pushing and setting the default route through a tunnel, Distributed compilation through VPN tunnels with distcc, and OpenVPN scripting. Chapter 11 shows how to debug and monitor VPN tunnels. It includes networking standard tools that can be used to scan and test the connectivity from the VPN server. Who is this book written for? Network administrators and one is interested in building secure VPNs using OpenVPN.