There is a migration tool that you can use to go from ACS 4.2 to ACS 5.2. Since your current ACS deployment is running an older version, I would recommend that you set up a separate, non-production ACS instance with the same version that you currently have, then restore a backup of the current database (or do a one-time replication to it), then upgrade it in steps until you reach 4.2, at which point you can use the migration tool.
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...