Configuring Domain Name System to receive dynamic updates

Domain Name System (DNS) servers running BIND 8 can be configured to accept requests from other sources to update zone data dynamically. This topic provides instructions for configuring the allow-update option so DNS can receive dynamic updates.

When creating dynamic zones, you should consider your network structure. If parts of your domain still requires manual updates, you might want to consider setting up separate static and dynamic zones. If you need to make manual updates to a dynamic zone, stop the dynamic zone server and restart it after you have completed the updates. Stopping the server forces it to synchronize all dynamic updates that have been made since the server loaded its zone data from the zone database. If you do not stop the server, you will lose all dynamic updates that are processed since it is started. However, stopping the server to make manual updates means you might miss dynamic updates that are sent while the server is down.

DNS indicates that a zone is dynamic when objects are defined in the allow-update statement. To configure the allow-update option, follow these steps:

1. In iSeries™ Navigator, expand your system > Network > Servers > DNS.

2. In the right pane, right-click your DNS server and select Configuration.

3. In the DNS Configuration window, expand Forward Lookup Zone or Reverse Lookup Zone.

4. Right-click the primary zone that you want to edit and select Properties.

5. In the Primary Zone Properties page, click the Options tab.

6. On the Options page, expand Access Control > allow-update.

7. DNS uses an address match list to verify authorized updates. To add an object to the address match list, select an address match list element type and click Add. You can add an IP Address, IP Prefix, Access Control List, or Key.

8. When you have finished updating the address match list, click OK to close the Options page.

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