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IKEv2 IPsec Virtual Private Networks: Understanding and Deploying IKEv2, IPsec VPNs, and FlexVPN in Cisco IOS by Amjad Inamdar, Graham Bartlett

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Chapter 1. Introduction to IPsec VPNs

This chapter introduces the concepts of Virtual Private Networks (VPNs), focusing specifically on Internet Protocol Security (IPsec); this chapter will also introduce the Internet Key Exchange protocol version 2 (IKEv2).

Ten years ago IPsec VPNs were commonly employed only for connectivity between site locations or for remote mobile workers requiring secure connectivity from hotels, where specialist software was required. With the advance of the Internet of Things, the number of devices that require secure connectivity over insecure networks is almost endless; the ability to connect, communicate with, and remotely manage every IP-enabled device over a secure medium has increased the demand for VPN technologies. ...

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