Introduction

The motivation for writing this book was to educate users and customers about the benefits that FlexVPN and IKEv2 bring and provide an in-depth coverage of the building blocks and topics related to IPsec VPNs in general, in an easy-to-understand manner. FlexVPN was a breath of fresh air with regards to VPN technologies; for the first time all VPN technologies could be configured under a single CLI construct. We want to educate users so that secure, efficient VPN technologies can be implemented not only using Cisco IOS, but with third-party equipment also.

FlexVPN has allowed IKEv2 and IPsec VPNs on Cisco IOS to become a lot more user friendly; IKE, IPsec, concepts of cryptography, and VPNs can be hard subjects to understand. This ...

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