How to Set Up Split DNS (7 Steps)

Go to the Windows server computer hosting the pages and hostname for which you want to create a split DNS. Click “Start” and enter “Services.msc” in the search box. Press the “Enter” key. The Services window appears on the screen.
Scroll down to the “Domain Name Server (DNS)” listing. Double-click the service name. In the DNS Properties window, click the “Startup type” drop-down list and select “Automatic.” Click the “Start” button, then “OK.” Restart the server computer and wait for it to boot into Windows.
Click “Start,” “All Programs,” “Administrative Tools” and then “DNS.” In the server list, right-click the name of the Windows server machine, and then click “Properties” on the popup list.
Click the “Forwarders” tab. Add the IP address of the remotely hosted machine on in the “All Other DNS Domains” area. This causes regular HTTP requests from outer-world network computer to redirect to the IP address of the server hosted by your hosting provider or ISP. Click the “Add” button.
Enter and add additional ISP IP address as needed. Click the “Apply” button to save the DNS changes.
Click the “Internal NAT IP Addresses” tab. Enter the IP address of a server computer on your network hosting Web services meant only for internal use or viewing. For instance, if the computer is on the same internal network, you might enter “192.168.0.2” or “10.0.0.2” depending on the IP scheme your network uses. If the services run from the server computer on which you are working, enter “127.0.0.1” in the field and click “OK.” Note that if the service uses a specific port -- for instance port 118 -- enter the local IP address in the “192.168.0.2:118” format.
Click “Apply,” and then restart the server. Wait for the server computer to restart and boot into Windows. Setup of the split DNS service is complete.
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