If you don’t know the IP address of your ISP’s DNS server or Gateway, you can find it with the winipcfg command.  Do the following:

  • Go to the Sharing computer. Go online if you have a dialup connection.

  • Click on the Windows Start button, select Run and type winipcfg. A window will appear.  Click on the “More Info” button to get the version of the window shown below:

Your ISP’s DNS server IP address is in the upper red-circled area.  The ISP’s Gateway  IP address is in the lower red-circled area.  (Don’t worry, you’ll be able to read the information in your window!  The information in the above diagram has been intentionally concealed.)