We have a few site to site VPN connections with 5505's. Is there any way to setup a redundant config incase the first one goes down it would reestablish to a second firewall with a different ISP? I am using 5520's at both ISP's.
You can create two peers for the VPN tunnels. But this will not solve your problem completely as the internal routing needs to be changed to the second pix when the first one fails. For options on changing the internal routing, we will need to know your setup better
You should be taking care of the routing part seperately. A weighted route will not work with PIX/ASA as the ethernet link will never go down unless the other end device goes down. However, you can track the link (reachability of the vpn peer) and map it to a route.
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...