Perhaps there is something in your environment that I do not understand. It sounds like you have an ASA5520 on one end and a 2800 router on the other. Where would the redundant tunnel go? If the second tunnel is from the same source and to the same destination would it not be carried like the first tunnel is carried? And if whatever is carrying the first tunnel were to fail would the second tunnel not also fail?
If there is something in your environment that I have not correctly understood then perhaps you can help me understand it better.
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...