If you really need the IP on your PC, call the ISP tech support and see if they will put the modem into "bridge mode". It will no longer act as a router and the Public IP will be directly on the piece of equipment that plug into the router.
Things to note:
- The ISP may be unwilling to do this, this depends on the ISP. They may only allow bridged modems for business class connections.
- If the ISP is willing to allow bridged mode, you may have to install additional software on your PC to use the connection, such as PPPOE software. This allows you to "log in" to the ISP network and get an IP from the ISP DHCP server.
- Even with the modem in bridged mode, you may not receive a static IP.
- With this setup, unless you put in your own router, chances are only one PC will be able to get online. The ISP may allow only one device per connection to receive an IP.
- This will make your PC, no matter what OS you are running, more vulnerable because you are directly connected to the Internet. Other systems on the Internet will be able to directly contact your PC, whereas the router didn't allow new incoming connections to reach your PC.
- It may be easier to see if there is a port forwarding feature in the router, if you can log in to the router. Just forward the needed ports to your PC, leaving your PC less vulnerable that if all traffic was connecting to it.