There is no CS-MARS replacement product offered by Cisco directly. They left that market segment when they killed MARS off. What they do instead is publish a list of "Technology Partners" that offer SIEM solutions recommended for use in Cisco environments.
The design guides for the partner products are posted in Cisco's "Design Zone" portion of their site, found here:
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...