The VPN has to be initiated from the device with the dynamic IP. The ASA can not use an FQDN as the peer (the IOS-router can). The dynamic crypto map is not attached to the interface. It's attached to the static crypto-map with a sequence that has to be higher then all sequence-numbers used for site-to-site connections.
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...
[toc:faq]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 and UDP are I...