Question : Problem: Setting up multiple ISP - Cisco 1812

We have 1812 series router presently supporting one ISP provider. ISP Provider has provided us a link which is connected to the Fa1/0 of the router and Fa0/0 is idle and have its config as

interface FastEthernet0
 description LINK TO (ISP NAME)
 no ip address
 ip access-group PERIMETER-WATCH in
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
 crypto map prmip

We are looking out to setup the new ISP to use the Fa0/0 interface of the router making it the default ISP and the old one the backup route.

Kindly provide the links for configuration and sugest to me if this not possible which router can support for my needs

Answer : Problem: Setting up multiple ISP - Cisco 1812

are your network routed to your ISP through BGP or static route ??

???

if static then:

ip route 0.0.0.0 0.0.0.0 int Fa0/0

ip route 0.0.0.0 0.0.0.0 FA1/0 GW 200