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Review the existing DNS Groups in the DNS tab, and create a new DNS Group if necessary. See Working with DNS Groups for details on editing or creating DNS Groups.
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Although it is not strictly necessary to have the InfoBlox server created in ProVision prior to import, creating or verifying the server at this point gives you an opportunity to test the connection and attach the InfoBlox server to the DNS Group selected in step 1.
Go to the DNS Tab, DNS Servers section, and either verify that the desired server is shown in the server list, or click the "Add Server" button to create a new InfoBlox server.
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Once server setup has been verified, navigate to the Data Import Tab in the Admin section. Select the "InfoBlox Zone Import" link.
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Verify the zones by exiting the Admin area of ProVision, clicking on the DNS tab, and reviewing the zones under the Group previously selected for the import.