How do I determine my gateway and DNS IP address?
Windows Vista / Windows 7
Click on the Windows icon, go to Start Search, type CMD and hit the Enter key .

The command prompt should open. At the command prompt type IPCONFIG /ALL and

In the list of information you will find the Default Gateway and DNS Server.
Windows XP
Click on Start, go to Run and click.

At the Run line type CMD and click on OK. This will open the command prompt.

At the command prompt type IPCONFIG /ALL.

In the list of information you will find the Default Gateway and DNS Server.