Config internet leaseline in Router Cisco 1841 (NAT)

# conf t
# interface FastEthernet0/0
# ip nat inside
# interface FastEthernet0/1
# ip nat outside
# ip route 0.0.0.0 0.0.0.0 220.231.92.13 (ISP gateway)
# ip nat inside source list 1 interface FastEthernet 0/0 overload
# access-list 1 permit 9.10.10.0 0.0.0.255