Dual ISP with Cisco 2801 and 5510

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Dual ISP with Cisco 2801 and 5510


We have a cisco 2801 which we use to route our internet traffic and a ASA 5510 we use as a firewall with VPN. We have NAT set up on the 5510. We also have a backup cable internet line we can use if the primary line goes offline. Our ip range from the primary line is 213.x.x.x/27 and the ip address (only 1) of the secondary line is 84.x.x.x.

Would it be possible to route the internet traffic to the secondary line automatically when the primary line is offline? I would say that the NAT table should be changed and the default route also. But how??? Is this possible? Any suggestions?

Thanks in advance.