Create local username database within the pix for vpn user authentication, look at this link, this is for version 7.x but it is based on same principle on 6.x code. After you create tunnel group name , fruther down will ask for type of user authentication either RADIUS or LOCAL, pick local to create user names.
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...