Is there a specific reason for you upgrading your ASA. For example, a feature in 8.0 or a software caveat that is fixed 8.0.
Also, are you doing any IPSEC or SSL VPN on the ASA. 7.2(3) has been very stable with IPSEC but if you are doing SSL VPN, you may want to consider 8.0 since there were some key bug fixes that went into the code. You can check the release notes for details.
We are running an pilot on 8.0.3 and we could not use any other version because of the features it delivers for ssl vpn. We implement a strategy that for each purpose we have a different box. That means for ssl vpn, firewalling and ipsec we use 3 different asa boxes.
But be aware that Cisco states for firwalling purposes you should stay at 7.2.x.
If you are planning to do SSL VPN, then go with 8.0 code, whichever one is the latest. There were a lot of bug fixes, specifically for SSL VPN that went into 8.0, so you are better off going to 8.0 then 7.2. Ofcourse, always go through the release notes and be prepared for any known issues, so there are no surprises :-)
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...