Here is my set up:
Home office has a T1 and a Cablemodem (When the T1 goes down we route traffic to the cablemodem router). Each has a cisco 831 router 192.168.2.1 and 192.168.2.2 respectively on our lan.
Remote offices (with cisco 806 or 831's) VPN into the T1 router.
My questions is: With this set up is it possible to have the remote offices establish a vpn with the cablemodem router in the event that the T1 fails?
If not, what kind of setup/hardware would I need to get the desired result here.