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Part IV. Using VPNs for Secure Connectiv... > Chapter 19. Fundamentals of IP Secur...

Chapter 19. Fundamentals of IP Security


This chapter covers the following subjects:

IPsec concepts, components, and operations

Configuring and verifying IPsec


IP Security (IPsec) has been around for a long time, and that is quite a good trick for any technology in today’s fast-moving world. The secret of IPsec is that it is not locked in to one specific protocol or even one set of protocols. As technology advances, so can the protocols that are being used by IPsec. The goal of IPsec is quite simple: to provide confidentiality, data integrity, and authentication of the virtual private network (VPN) peer and provide antireplay support. It implements all of these to Layer 3 packets individually, protecting each one as they are sent from one end of the VPN tunnel until they reach the other end.


  

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