Our ASA 5510 has sw ver 8.0(2) and DM ver 6.0(2). Through ASDM on the menu Configuration>Site-to-site VPN>Advanced>IKE parameters under NAT transparency we checked "Enable IPSec over NAT-T" and wrote config to startup and also we did it manually. After power failure and start ASA 5510 lost this part from config file. So we have to put command "crypto isakmp nat-traversal" manually. Because through ASDM it hasn't effect. It's happened two times.
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...