Port Forwarding without NAT overload

NAT
!
interface gigabitEthernet0/0
 ip address 203.203.203.2 255.255.255.252
 ip nat outside
!

interface GigabitEthernet1/0
 ip address 192.168.254.254 255.255.255.0
 ip nat inside
 !

ip nat inside source static tcp 192.168.254.150 21 203.203.203.2 21
ip nat inside source static tcp 192.168.254.150 80 203.203.203.2 80
ip classless
ip route 0.0.0.0 0.0.0.0 203.203.203.1

Note ***
    Unsecure