Tech Tip: Configure a split DNS system

Last time, we discussed the benefits of using Windows Server 2003 DNS services. Now, let's look at how to configure and manage a split DNS system.

If you're using Active Directory, you already have Windows-based DNS services installed. We'll assume that you're running a Windows Server 2003-based Active Directory server with DNS.

To manage the DNS servers, follow these steps:

  1. Go to Start | All Programs | Administrative Tools | DNS.
  2. Right-click the server name, and choose Properties.
  3. On the Forwarders tab, it should say All Other DNS Domains in the DNS Domain box. This means the server will automatically forward any requests for DNS domains that it doesn't handle to the servers listed in Selected Domain's Forwarder IP Address List.
  4. Add your ISP's DNS servers to this list. Type the server's IP address, and click Add.
  5. Repeat the process for each of your ISP's DNS servers.
  6. When you're finished, click Apply.

Next, add the appropriate entries to the domain for which you want to add services. Configure this server using the internal NAT IP addresses. Continue to update your ISP's DNS records with the translated or "real" IP address.

You'll also need to configure your internal workstations to use the Windows Server 2003 DNS system as their primary DNS server. You can accomplish this by using a DHCP option.

When your internal users try to access the server, they're resolving the address using the internal DNS server. External users will continue to perform name resolution based on the entries at your ISP, which has the translated, routable IP addresses.

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