For IPS, it is better to turn on automatic updates. Just go to:
Admin >> System Setup >> IPS Signature Dynamic Update Settings
The URL is already set there, just put your CCO username/password and click 'Update Now' then hit 'Submit'. I think the current Signature release is 352. You can manually downlaod them from here if you like:
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...