Configuring Upstream Address Family Preference

NIOS sends upstream queries using both IPv4 and IPv6 interfaces when the configuration allows dual network interfaces for DNS services. From NIOS 9.0.4 onwards, NIOS provides an option to restrict upstream queries to either IPV6 or IPV4 only, without impacting the downstream queries.

Note

The Upstream Address Family Preference option works only if the Allow recursion checkbox is enabled at the Grid or member level.
The Upstream Address Family Preference option is available only the DNS member level and not at the DNS view level.
If you want to select only IPv4 option listed in Upstream Address Family Preference option, ensure to configure at least one IPv4 forwarder. Similarly, if you want to select only IPv6, ensure to configure at least one IPv6 forwarder.
If a custom root name server is configured, ensure that the custom root name server's configuration meets the requirements for the Upstream Address Family Preference option.

To configure upstream address family preferences:

From the Data Management tab, select the DNS tab and click the Members tab -> member checkbox -> Edit icon.
In the Member DNS Configuration editor, click General -> Basic tab.
In the Upstream Address Family Preference option, select one of the following from the dropdown. By default, ANY is displayed. If you want to select only IPv4 or IPv6, ensure that the dual stack is configured where the DNS listens to both the IPv4 and IPv6 interfaces in the NIOS Grid.
ANY-Select this to send upstream queries using IPv4 or IPv6.
IPv4-Select this to send upstream queries using IPv4.
IPv6-Select this to send upstream queries using IPv6.
Save the configuration and click Restart if it appears at the top of the screen.