We ran into the same issue you have and our Cisco rep told us to use the IOS firewall feature set. At that time we didn't have it but we were able to purchase an upgrade. The upgrade allowed us to build firewalling capabilities into our router configuration. Met our budget and got the job done! I'm sure there is multiple ways of doing this, so I'm interested to know if anyone else has done it differently?
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...