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Note

From NIOS 9.0 onwards, IB-4030 and IB-4030-10GE appliances are not supported.
Similar features and functionalities are available on software-based DNS Cache Acceleration appliances, and it is recommended to use the software-based DCA supported appliances. For a list of supported appliances, see as described in Supported DNS Cache Acceleration Appliances.

To achieve optimal DNS query resolution performance, ensure that the switching infrastructure surrounding the IB-4030 or IB-4030-10GE can handle high performance gigabit ethernet traffic load. Efficient IB-4030 or
IB-4030-10GE operation requires switches with adequate memory buffer capacity and support for 1000Base-TX full duplex operation.

Note

Operation of the DNS caching features requires a DNS Cache Acceleration license. For information about licensing requirements,  see as described in DNS Cache Acceleration Appliance System Configuration.

The DNS service and the DNS cache acceleration service are disabled by default on NIOS appliances. They must be enabled after adding the appliance to the network. For information, see Enabling the DNS Cache Acceleration Service and Enabling the DNS Service below.

Enabling the DNS Cache Acceleration Service

Note

You can select to start the DNS Cache Acceleration Service first. Should you do so, the appliance will also start the DNS service and display a notification that it is doing so.

To enable the DNS Cache Acceleration service on the DNS Cache Acceleration appliances, do the following:

  1. From the Grid tab, select the Grid Manager tab and click DNS Cache Acceleration.
  2. Select the Grid_member check box for the appliance.
  3. Click the Start icon to activate the DNS Cache Acceleration service on the appliance.
  4. To disable DNS Cache Acceleration Service: click the Stop icon.
    Ensure that DNS recursion checkbox is enabled at the Grid/Member/view level.

If the DNS Cache Acceleration appliance is an independent appliance, do the following:

  1. From the System tab, select the System Manager tab and click DNS Cache Acceleration.
  2. Click the Start icon to activate the DNS cache acceleration service on the appliance.


Note

The appliance displays a warning message if the average DNS cache acceleration utilization rate exceeds 85%.

Enabling the DNS Service

Note

The DCA (DNS Cache Acceleration) service is dependent upon the DNS service. Thus, when you start the DCA service, the DNS service will start automatically. However, if you start the DNS service first, you must start the DCA service separately. When both services are running on an appliance and you want to stop both services, you can select to stop the DCA service first and then stop the DNS service. If you stop only the DCA service, the DNS service will continue to run. In the same situation when both services are running and you stop the DNS service first, then the DCA service will stop automatically. 

To enable the DNS name resolution service for an installed DNS Cache Acceleration appliance in an Infoblox Grid:

  1. From the Grid tab, select the Grid Manager tab, ensure that DNS is currently selected and select the Grid_member check box.
  2. Click the Start icon to activate the DNS service on the appliance. To disable DNS, click the Stop icon.
  3. Save the configuration and click Restart when it appears at the top of the screen.

If the appliance is an independent appliance for the network, do the following:

  1. From the System tab, select the System Manager tab, ensure that DNS is currently selected and select the Grid_member check box.
  2. Click the Start icon to activate the DNS service on the appliance. To disable DNS, click the Stop icon.
  3. Save the configuration and click Restart if it appears at the top of the screen.

Specifying Grid-Level DNS Cache Acceleration Settings

Each DNS response cached in the DNS Cache Acceleration appliance has its own TTL (Time-To-Live) value. For example, entering a value of 3599 seconds (1 hour-1 second) ensures that the appliance caches all DNS responses with a defined TTL of one hour (3600 seconds) or greater. All DNS responses with TTL values of 3599 seconds or less will not be cached by the appliance, and will instead be cached by non-accelerated cache server.
To specify Grid DNS cache acceleration settings:

  1. From the Data Management tab, select the DNS tab, expand the Toolbar and click Grid DNS Properties. 
  2. In the Grid DNS Properties editor, click DNS Cache Acceleration.
  3. By default, the Don't Cache Records with TTL Less Than... setting defaults to a value of One (1) second. The maximum permissible value is 65000 seconds (slightly over 18 hours).
  4. Enter the new TTL value in the Don't Cache Records with TTL Less Than... field.
  5. Save the configuration and click Restart to restart services.

Specifying Member-Level DNS Cache Acceleration Settings

The TTL setting on the Member page applies only to an independent appliance.
You select the Override option to modify the TTL cache setting for the appliance. By doing so, the new caching value supersedes the value specified at the Grid level. If you select the Override option and do nothing else, the appliance inherits its settings from the Grid.
To specify DNS Cache Acceleration settings for the member:

  1. From the Data Management tab, select the DNS tab -> Members tab -> member check box.
  2. Click Edit.
  3. In the Member DNS Properties editor, click DNS Cache Acceleration.
  4. By default, the Don't Cache Records with TTL Less Than... setting is defined to inherit its value from the global Grid setting. The Override button is associated with this field.
  5. To modify the TTL value, click Override. The field is enabled and the button changes to Inherit.
  6. Enter the new TTL value in the Don't Cache Records with TTL Less Than... field. The maximum permissible value for this setting is 65000 seconds (slightly over 18 hours).
  7. To use the caching TTL value used across the Grid, click Inherit. The button changes to Override and the field is disabled.
  8. Save the configuration.
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