Generally the latest GD release is the recommended version code to use,however, it varies on network environments and opened caveats , for example I have used GD and have encounter bugs that are fixed in in non GD releases. Best approache is to look at realeases opened caveats and plan accordingly.
We deployed not to long ago a set of 5510s A/S firewalls for our second DR site, I went straight and upgraded both firewalls to lates train in 8.0 code which is 8.0(4) no issues as of today.. but again it depends on what your environment uses and that is where looking at opened bugs comes in place.
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...