How to use Openprovider nameservers to host zones from another master server?
In order to use Openprovider nameservers as slaves, one has to configure Access Control Lists on the master nameserver to allow AXFR transfers from the following IP addresses:
To check whether or not Openprovider can read one's master server navigate to DNS management > DNS Checks and selectbutton. Enter the domain name and the IP address of the master nameserver, to see the result of the check.
Last but not least, the zone file of the master nameserver should contain the NS record of Openprovider - ns1.openprovider.nl.