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To use Unbound DNS, you must install the Dual Engine DNS license (in addition to the DNS Cache Acceleration license) on your IB-4030-10GE appliance. Contact your Infoblox representative to obtain these licenses. For information about how to install licenses, refer to the Infoblox NIOS Administrator Guide.
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When the Dual Engine DNS license (either temporary or permanent) expires, you will not be able to change the resolver type from Unbound to BIND. You must install a permanent license or extend the current license in order to change the resolver type. |
When you use Unbound as the DNS resolver, the appliance acts as a recursive-only name server. Before you use Unbound DNS resolution, ensure that you understand some of the limitations and ramifications. For more information, see Best Practices for Configuring Unbound DNS below.
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- Ensure that you have the Dual Engine DNS license installed on the appliance.
- From the Data Management tab, select the DNS tab -> Members tab -> member check box -> Edit icon.
- In the Member DNS Properties editor, click Toggle Advanced Mode.
- When the additional tabs appear, click the General tab -> Advanced tab.
- In the DNS Resolver Type section, select Unbound. To use the standard DNS resolution, select BIND. Note that when you switch between Unbound and BIND, the appliance preserves all relevant configurations.
- Save the configuration and click Restart to restart DNS service.
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You must restart DNS service for the configuration to take effect. |
Unbound DNS Logging
Logging is available when you select Unbound as the DNS resolver. However, the format and severity levels are different than that of the standard DNS logging. You can select the severity level for Unbound DNS logging, but you cannot configure logging facilities and categories—these functions will not be displayed in Grid Manager.
To configure the severity level for Unbound DNS logging:
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When you configure your appliance to use Unbound as the DNS resolver, the IB-4030-10GE acts as a recursive-only name server and some of the NIOS features are not supported. As a result, corresponding tabs and functions for these features do not appear in Grid Manager when Unbound DNS is configured. The following table, Table 4 lists NIOS features that are not supported for Unbound DNS.
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In the default DNS view, certain unsupported features are displayed in Grid Manager and you can configure these features for members that are not using Unbound DNS resolution. |
Table 4 Unsupported Features for Unbound DNS
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Unbound DNS supports the configuration of hostname bind directive and server-id directive options, which enables the appliance to return the hostname of the answering DNS name server in response to queries from clients in a DNS anycast configured environment. For information about how to configure the hostname bind directive and server-id directive options, refer to the Configuring Hostname and Server ID Options section in the Infoblox NIOS Administrator Guide.
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Even though you can configure both hostname bind directive and server-id directive options, Unbound DNS ignores the hostname bind directive setting and considers only the server-id directive setting. |
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