NetApp
Configuration > Network > DNS : Managing DNS : Enabling or disabling dynamic DNS

Enabling or disabling dynamic DNS
You can use the Edit DNS Settings dialog box to enable or disable dynamic DNS on your storage system. Dynamic DNS is disabled by default.
Steps 
1.
From the Home tab, double-click the appropriate storage system.
2.
In the navigation pane, click Configuration > Network > DNS.
3.
Click Edit, then click Dynamic DNS.
4.
Either select or clear the Enable dynamic DNS check box, as appropriate.
5.
Click Save and Close.