We recently implemented the 5.x signature style to a 2821 router and drove cpu utilization to 100%. It turned out that by default all of the available signatures were enabled, and the router can't handle that. We ended up retiring all signatures and then returning signature groups of interest to service incrementally until our CPU utilization stabilized at about 20%.
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...