This book explains how to plan and build a Virtual Private Network (VPN), a collection of technologies that creates secure connections or "tunnels" over regular Internet lines. It discusses costs, configuration, and how to install and use VPN technologies that are available for Windows NT and Unix, such as PPTP and L2TP, Altavista Tunnel, Cisco PIX, and the secure shell (SSH). New features in the second edition include SSH and an expanded description of the IPSec standard.
This book solved a lot of problems for me. While much of the product coverage no longer applies, the theory and practice of the VPN, as well as the basic need for such a technology gave me the information I needed to convince my upper management to use VPN's better.
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