track 123 rtr 1 reachability
 delay down 15 up 10
!         
track 345 rtr 2 reachability
 delay down 15 up 10
!
!
interface FastEthernet0/0
 description OPTONLINE - CABLE MODEM
 ip address dhcp
 ip dhcp client route track 123
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
 crypto map mymap
!  
interface FastEthernet0/1
 description AT&T - T1
 ip address 12.171.xx.xx 255.255.255.240
 ip virtual-reassembly
 ip nat outside
 duplex auto
 speed auto
!
ip route 0.0.0.0 0.0.0.0 FastEthernet 0/1 track 345 
!
ip nat inside source route-map dhcp-nat
 interface FastEthernet 0/0
ip nat inside source route-map fixed-nat
 interface FastEthernet 0/1
!
ip sla 1
 icmp-echo xx.xx.112.1 source-interface FastEthernet 0/0
 timeout 1000
 threshold 40
 frequency 3
!
ip sla 2
 icmp-echo 12.117.xx.xx source-interface FastEthernet 0/1
 timeout 1000
 threshold 40
 frequency 3
!
ip sla schedule 1 life forever start-time now
ip sla schedule 2 life forever start-time now
!
route-map dhcp-nat permit 10
 match ip address INSIDE_NAT_ADDRESSES
 match interface FastEthernet 0/0
!
route-map fixed-nat permit 10
 match ip address INSIDE_NAT_ADDRESSES
 match interface FastEthernet 0/1
!
ip access-list extended INSIDE_NAT_ADDRESSES
 deny   ip 172.16.0.0 0.0.255.255 192.168.1.0 0.0.0.255
 deny   ip 10.10.0.0 0.0.255.255 192.168.1.0 0.0.0.255
 permit ip 10.10.6.0 0.0.1.255 any
 permit ip 172.16.0.0 0.0.0.255 any