Another possibility is that the "qos pre-classify" is just maintaining the orginal packets class after it encrypts. This would mean that the encrypted packets are going through QOS after encryption. (reordering) Many of the documents state the QOS will be done before the encryption, but if that is true I wouldn't be getting replay errors.
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...