You can make an informed guess by checking on the date of purchase of the PIX. Another possibility is that you start by assuming some version (which is probably what you will end up doing). I have been told that attempting a pasword recovery using the recovery file for another version should not damage the PIX. Guess, you should cross check this before proceeding.
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...