I have IPSEC tunnel connection between two sites. Tunnel is established between two Pixes 506E. Each site has addditionally ISDN router behind the PIX. I would like to use ISDN as a backup in case of ipsec tunnel failed. How I can monitor status of the tunnel and make ISDN router to detect tunnel failure and activate connection.?
I would say, configure a GRE tunnel between the ISDN routers, and then encrypts that GRE stuff within IPSec. This way you could monitor the routes coming over the GRE tunnel and make them prefered routes. If the tunnel stops working and you stop getting the routes, then ISDN will kick in for the routes on the remote subnets
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...