conf t
host RemoteGW
int s0/0
ip add 220.20.20.1 255.255.255.252
no sh
int f0/0
ip add 192.168.1.254 255.255.255.0
no sh
exit

ip route 0.0.0.0 0.0.0.0 220.20.20.2

ip nat inside source list NAT int s0/0 overload
ip access-list standard NAT
permit 192.168.1.0 0.0.0.255
exit
int s0/0
ip nat outside
int f0/0
ip nat inside