October 2005
Intermediate to advanced
480 pages
14h 36m
English
Content preview from VPNs Illustrated: Tunnels, VPNs, and IPsec
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5. Virtual Private Networks
5.1 Introduction
In Part 2, we discuss virtual private networks (VPNs). Chapter 4 had some examples of VPNs, but we were interested mainly in their tunneling aspects and didn’t dwell on their security and authentication features.
In this chapter, we define VPN and briefly revisit the VPNs from Chapter 4. In the rest of Part 2, we study several types of VPNs, see how they are used, and take note of their strengths and weaknesses. As we shall see, these VPNs can operate at any layer in the TCP/IP stack. As usual, we will be less concerned with the administrative details of configuring the VPNs than with developing an appreciation for the protocols themselves and the manifestation of those protocols on the wire. ...
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