Cisco Router Configuration Using Ethernet Interface as Backup to Serial (T1) interface

HI,
I have 2 connectoins to the internet. One is a T1 which is my primaray connection and the other is a cable modem that is on the ethernet interface of my router. What I am looking to do is have the calbe as a backup to my T1 incase the serial goes down.  Does anyone have any sugguestions or sample configurations for this?

Thanks,
Eric
eheuserAsked:
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t1n0m3nCommented:
ip route 0.0.0.0 0.0.0.0 Serial0/0 1
ip route 0.0.0.0 0.0.0.0 1.1.1.1 2

Where Serial0/0 is your router's interface that has the T1 connected to it.
and
1.1.1.1 is the default gateway of you cable modem provider (given to you by the Cable ISP)
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lrmooreCommented:
Hmmmm... routing will work, but NAT might be a little more tricky...
Where is the NAT taking place? On this router, or upstream, or a firewall behind it?
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