Question

How to use Openprovider nameservers to host zones from another master server?

Answer

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:

18.203.73.190
185.27.175.218
2a00:f10:121:400:4be:60ff:fe00:526

The above IP addresses need to be added to the server software if the reseller is using hosting control panels like Plesk, cPanel, etc.

To check whether or not Openprovider can read one's master server navigate to DNS management > DNS Checks and select Check whether the Openprovider nameserver can be used as slave radio button. 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.

The interface of zone adding is almost the same as for the master ones. Navigate to DNS management > New DNS zone page in RCP and choose the appropriate type of zone:

Once done with the name, proceed to the next steps where you can configure the IP address of the master server:

The records will propagate within a couple of minutes.

Note: The first time you've whitelisted the IP address in your software it can take up to 1 hour before the slave zone will start propagating.