I'm trying to keep the CPU down as much as possible on my ASA-5540. We're running 8.2.5 on it. We have a bout 80 active IPSec tunnels so far, all which are using AES-256 bit for phase1/2, 75 of the tunnels are mostly ezy vpn connections. Currently the CPU during peak usage is averaging around 22%. We're planning on having over 1000 IPsec connections, mostly will be remote vpn access with about 170 of them ezy vpn and 250 l2l tunnels.
Is there any noticable CPU performance gain by using AES-128 bit instead of AES-256 on the phase2?
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...
[toc:faq]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 and UDP are I...