Yes it can Although I did run into an MTU issue with the Exchange server that could have been caused by the ISDN connection. I just adjusted the MTU on the server and client and it has been fine since. Cisco Secure version 3.03 Allows for an MTU adjustment. It actually adds an entry in the registry.
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...