Pinging across the FWSM interfaces are not supported. You won't be able to ping the inside interface of the FWSM when ping is coming from the outside interface.
You can only ping the interface where the traffic is coming from, ie: if it's routing via the Outside interface, you can only ping the Outside interface, not the Inside interface, and vice versa, if it's routing via the Inside interface, you can only ping the Inside inteface, not the Outside.
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...