IKE is the generic name for Phase 1 in the VPN setup. This is the part when the devices are agreeing on some settings and generates some keys then authenticates each other (the isakmp key if preshared is used, or the digital certificates).
IPSEC is the Phase 2, the devices are authenticated and they will create the keys to encrypt the traffic flow (crypto maps).
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...