NAT/PAT
Network Address Translation is the process of using your public IP address on behalf of your private network for requests outside on the local network. IE: Internet/WAN.
int g0/1
ip nat "inside"
exit
int g0/0
ip nat "outside"
exit
acccess-list 1 permit "172.168.16.0.0 0.0.255.255"
ip nat inside source list 1 int g0/0