i wanna why do i have 2 IP add and which one should i use to allow my friends to connect to my PC?
Machines usually have one IP address for each interface, whether that is an Ethernet card or a modem link. The IP address assigned to the modem is the public one that other Internet users can connect to, the internal address of the network card is not usually visible across the Internet and so is kept private.
That's a good thing because it means that people using the net can't get access to traffic on your internal network. Sometimes you want some access from the Internet to a machine on your internal network. You do that by configuring the machine that has your public IP address to open a port, and route traffic going into that port to a port on the private address of a machine on your internal network.
You may have bought a combined modem and router for your ADSL connection. If you have an ADSL modem connected directly to your PC then you can program your PC to route traffic from port 5900 of your public IP address to whatever port VNC is using on your private network.
Generally you get better security if you have a dedicated router between your public IP address and the private addresses on your network. That's why I usually recommend buying a combined modem/router instead of just an ADSL modem, even though the modem is usually cheaper.
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