it depends on your routing. Your routing should be setup in a way that when your leased line is up the default route should be pointing via leased line and when your leased line is down the default route should be pointing via adsl.
The problem was that the remote site was set to bi-directional and was constantly trying to bring up the connection seemingly confusing the normal routing.
I switched it to answer only and the Failover required site is bidirectional so now normal routing occurs when the link is up, but then when the link goes down the ADSL path takes over the routing and the VPN kicks in as expected.
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...