interface FastEthernet0
 ip address 192.168.2.1 255.255.255.0
 ip nat inside

interface BVI1
 ip address 203.222.156.10 255.255.255.252
 ip nat outside
!
ip nat inside source list 10 interface BVI1 overload
ip route 0.0.0.0 0.0.0.0 203.222.156.9
!
access-list 10 permit 192.168.2.2