Customer is using cisco vpn client 4.x for windows and terminating the ipsec tunnel on a cisco 7200 IOS router using a loopback interface. This works in IOS 12.3(15) but when we upgrade to 12.4(7):
the IKE phase 1 fails. But if we terminate the tunnel on the physical interace or create a sub interface it works OK for 12.4(7). Customer would prefer to use a loopback interface as it is always up. Has anyboby any suggestions or aware of any changes in 12.4(7) as to why it fails.
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...