set up computer as public IP and expose to internet

[chuikingman 0]

How can I set up the computer(win XP) and router in order to expose the computer to internet .

So, public can fto in and out to this computer .

The computer is connect to the router that use PPPOE to access internet .

The computer is connected the router by direct cable

The router is TP link TL-WR740N.