The recovery CD was only for older appliances like the IDS-4210, IDS-4235, and IDS-4250s.
Newer appliances and all modules do not use a Recovery CD and instead use a System Image file. The System Images have an advantage over the CD because they can often be installed remotely without requiring physical access to the sensor. (NOTE: For appliances requires remote access to the console port through a terminal server. For modules it requires remote access to the parent device.)
For the IDSM-2 you can download the 5.1 System Image file from:
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...