Does ASA5510 check xlate table first when coming from inside?
Cisco document says by default traffic from higher level interface to lower level interface is always allowed. However it seems for traffic going from higher interface to lower interface, ASA always checks xlate table first. So there should always be some type of NAT (pool or static) or PAT configured from higher interface to lower interface.
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...