This is a common problem with all sensors. Unfortunately there are several failues that a sensor can experience. To test all aspects of a sensor, create a custom signature tha twill fire on any traffic with a summary (so you only get an alert every X min). Then feed this event (SDEE or Syslog) into a system that looks for the absence of the event.
We call it a heartbeat sig. Cisco borrowed the idea and was going to put it into 6.0 as a standard signature, but for some reason abdoned the feature.
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...