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CompTIA Network+ Video Mentor: DNS Server Configuration

  • Apr 19, 2010
Ever ask, “What are DNS aliases?” or “How do I forward DNS requests out to the Internet?” David Prowse, creator of CompTIA Network+ Video Mentor, covers how to configure new host entries in your DNS server and create aliases that point to those hosts, as well as enable DNS forwarding.
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The Domain Name System (DNS) resolves between host names and IP addresses. It can also resolve between domain names and IP or fully qualified domain names (FQDNs) and IP. Nowadays, it is centralized, automated, and can be dynamic. It takes the place of the flat text file hosts.txt. The following screencast, and ensuing article, cover three basic DNS labs:

  • Part 1: Creating new hosts
  • Part 2: Creating aliases
  • Part 3: Configuring the DNS server to pass DNS requests to the Internet

This lab assumes that you have a Domain Controller/DNS server already installed. It can be the same computer or two separate computers that are part of the same domain. For more information on setting up a Domain Controller, see my website. (Free registration required.)

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Part 1: Creating New Hosts

  1. Verify that DNS is installed and has a forward lookup zone.

    2. NOTE

    On the clients, you may need to change the preferred DNS server to your LAN DNS server[md]especially if the clients are currently connecting to the Internet with an ISP-supplied DNS server.

    1. Add the DNS snap-in to your MMC or open the DNS console from your Administrative Tools.
    2. Expand DNS, then expand the server (for example, 2003DC), and look at the forward lookup zones to make sure your domain is listed.
  2. Click your domain name to select it (for example, DPRO.COM). The host list should be displayed on the right window pane.
  3. Add a static entry.
    1. Right-click anywhere in the work area in the right window pane and choose New Host (A).
    2. Add the name of the computer. (DNS will automatically use the parent domain name if you only enter a NetBIOS name, which is actually known as a host name in this scenario!) It doesn’t have to be a real computer; you can add hosts that are not yet part of the network.
    3. Add the computer’s IP address, as shown in Figure 1.
    4. Click Add Host. You now have a static entry. Well done!

Figure 1 Adding a host named PC1 with the IP address 10.254.254.9.

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