There should be NO ACL. Don't use a crossover ethernet cable or fiber to connect the two failover LAN interfaces. Instead, each interface should connect to a switch port so that the link status is always up to one firewall interface if the other firewall interface fails. Otherwise, both units sense a link-down condition and assume that their interfaces have a failover.
Yes, a crossover will work; but it isnt a best practice.
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...