The technique that you use is largely dependant on the specific VPN client and the device they are connecting too. If the client is the Cisco VPN client and the device supports NAT Transversal or IPSec/UDP, you shouldn't really have to do anything.
However, many VPN solutions do not support these features. In these cases you may have to create a static nat between the PC and an available outside IP.
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...