For multiple context mode, each context must use different interfaces; you cannot share an interface across contexts.
For multiple context mode, each context typically uses a different subnet. You can use subnets that overlap, but your network topology requires router and NAT configuration to make it possible from a routing standpoint. Refer this blog
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...