I am attempting to determine if the following is possible and if it is, can anyone help me out?
I have two Cisco 2620 routers that are connected via a Frame Relay circuit. I route IP traffic through them as well as VoIP. On "Router1" I have a point-to-point connection to the Internet and on "Router2" I have an ADSL WIC connected to a ISP. What I'd like to do is use the Internet as a "failover" connection so that if my Frame Relay connection ever goes down, I can use the Internet as my "DBU", but instead this wouldn't dial up since it is ADSL and not ISDN or some other dial up scheme.
From all the docuementation I've read, I have come up to a dead end. I don't know if I need a PIX firewall or a VPN module in my routers or ? I don't have the funds to purchase much equipment, so I was hoping to do this with the routers I already have. I have found a Cisco document entitled "Cisco - Configuring IPSec with EIGRP and IPX Using GRE Tunneling" While this document comes close to what I'm trying to do it falls short.
Just make sure delay or bandwidth (the preferred method is delay, not bandwidth, but bandwidth is possible) aren't set too high or the routes won't be placed in the eigrp topology table (ie make sure the routers still see the backup internet routes as feasible successors).
Neither router has a route to the others public IP (facing the internet) so to reach that tunnel destination, it will send packets over the internet.
Add the IPsec config as needed (only neeed IOS that supports IPSec, don't need firewall or VPN devices).
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