I would suggest using routed mode. The outside interface of your FWSM will be in the same IP subnet as the MSFC interface but in a different vlan ie. you create 2 vlans with the same IP subnet, the MSFC is in one vlan and the FWSM is in the other vlan and you bridge the 2 vlans together with the IDSM-2 eg.
My customer has FWSM IDSM and NAM module with 6500 switch and has the following requirement.
1- Inter VLAN communication needs to be protected by FWSM and IDSM (only inline mode). I have never seen IDSM-2 with inline setup in any of my previous HLD's.
2- Customer has collapsed core architecture with access switches terminating at 6509 directly to FWSM (facing inside). With FWSM running inside, I only have 2 options for redundancy. Either use routed mode and run ospf at the access layer (eigrp not supported on FWSM) or run FWSM in transparent mode.
If you have ever faced such scenario, would appreciate if you could share your experience.
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...