So your remote users currently connect to the VPN via 203.189.x.x and you want to move them to a different interface? Does this new interface connect directly to the internet?
If this is the case then this is not possible because you would need a default route on your ASA to reach all the remote access clients. Since the ASA only supports one active default route you are limited to use the interface that connects to the internet.
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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...