Here is a URL that explains the information under "System Status" on the VPN 3000 concentrator.
The System Memory Summary shows how much memory is installed on the concentrator, whether there is sufficient memory for normal operation of the concentrator, and a breakdown of memory usage in memory blocks.
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...