setup proxy in between public pc's and ISP: (this proxy should handle all ports for ex: 21,22,23,80)
Two pc's (80.223.223.12 ubuntu installed (will act as a proxy) and 80.223.223.13 ubuntu installed (will act as a client) )
1) setup Gateway for 80.223.223.13 client pc to redirect traffic to proxy
2) setup proxy on 80.223.223.12 using iptables