well, the IOS firewall feature doesn't deal with route lookup therefore your routing is not affected, only a tcp/udp session is maintained to create dynamic ACLS for return traffic, so yes your traffic would not be blocked,
Even with IPS configured you are safe and may do the configuration in real time as default action for all the signatures are "ALRERT" and even if a signature is fired , the "concern" traffic is not blocked
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...