YEs, you need an MSFC to run the FWSM. The FWSM and the MSFC create a secure VLAN interface (SVI) between themselves, this VLAN is used for the communication between the FWSM and the router. This is all done internally in the switch in conjunction with the Sup card, so all the modules have to be internal.
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...