I will be upgrading a number of firewalls from 8.2(5) and 6.4(5) to 8.4(2) and 6.4(9). Will all of my current configurations be lost? I seem to remember that port forwarding acted different in the updated iOS. Will the forwarded ports and 1:1 NAT settings stop working after the upgrade?
From 8.3 on memory requirements changes (512MB) for ASA5505. Also, there are NAT changes. Check the below link to get some idea. Search in the forum , you will lot of postings with ref to similar upgrade. If you have a spare unit, I suggest you test the configuration (new) on that before move to production.
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...