Chapter 10. Virtual Private Networks (VPN)

This chapter introduces the IPSec protocol and its role in providing VPN service. The focus is on implementing LAN-to-LAN VPNs using IPSec with preshared keys. The chapter also addresses interoperability issues between Cisco devices and other popular IPSec implementations.

The topics discussed in this chapter are as follows:

VPN overview

Linux-based VPNs

Windows-based VPNs

VPN Overview

A virtual private network (VPN) enables private networks to communicate securely over the unsecured public network (that is, the Internet). These connections behave as a single virtual network, despite being geographically separated. VPNs provide inexpensive alternatives to expensive leased lines–WANs. VPNs also ...

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