Hi,
I am looking for documentation or a config on how to implement IPSEC encrypted ISDN dialup internet access, as a backup to a dedicated T1 IPSEC VPN. Basically I have 1760 with a T1 internet connection running a typical IPSEC VPN back to a central hub, using GRE and routing protocols to detect failures. I have currently implemented ISDN DDR back to the main hub, but would like to eliminate long distance charges on my ISDN line. I can have a dialup ISDN account with the ISP for backup, but I am not sure how to setup the router to have a failover IPSEC VPN on the ISDN internet connection when the T1 goes down. Any one have a similar scenario? I have successfully made the IPSEC VPN work over the ISDN dialup, but I'm not sure on how to set it up as a failover secondary connection.
Thanks,
Billy Dedek, CNE, CCNA