The virus update signatures pertain to an obsolete co-ordination feature between the Cisco IPS and TrendMicro ICS, as per a Cisco Signature expert:
"The virus updates were distributed/managed by the Incident Control Server (ICS) product that was a joint effort between Trend Micro and Cisco. Trend had the ability, via the ICS, to push anti-virus signatures to a Cisco IPS Appliance for emergent virus control. ICS never caught on and has since been discontinued. We continue to ship, as a base, the last update level that Trend published (V1.4). At some point in the future, we plan to remove the Virus Update label and just include the V1.4 signatures in a base S... signature set. "
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...