RDNS Servers

To add a new RDNS server, please proceed as follow:

Click on "IP Manager" -> "RDNS Servers" at the sidebar.
Click on the plus sign icon (right corner at the bottom).

A dialog will open, where you can insert the access details to the RDNS Server.

Supported RDNS Providers

This list refers only to self-managed RDNS servers. External providers (e.g. OVH) typically do not require additional configuration.

PowerDNS
Custom RDNS Servers

Create DNS Zone

After you have added the RDNS server, you can create a DNS zone for each subnet:

Click on the list symbol.
Select "Create DNS Zone" in the dialog.
Fill out the form and save the input.

IPv4 configuration

You need to create a zone for each /24 IPv4 subnet. So if you have the subnet 10.10.8.0/22, the following zones must be created:

10.10.8.in-addr.arpa
10.10.9.in-addr.arpa
10.10.10.in-addr.arpa
10.10.11.in-addr.arpa

IPv6 configuration

It is recommended to create a separate zone for each /32 subnet in IPv6. It is not necessary, and not recommended, to create a zone for each /64 subnet, as the /32 zone can be assigned to all subnets that fall within the prefix. When a larger IPv6 prefix zone exists, Tenantos will automatically detect it and use that zone.

For example, for the subnet fd12:3456:7890::/32 the zone would be: 0.9.8.7.6.5.4.3.2.1.d.f.ip6.arpa

Assign subnet to RDNS server

After you have created the DNS zones, select "Add Subnet Assignment" in the dialog and enter your subnets. As example:

10.10.8.0
10.10.9.0
10.10.10.0
10.10.11.0

You can also assign the subnet to an RDNS server on the subnet configuration page.

If you have added IPv6 subnets and divided them into smaller subnets (childs), you can assign the RDNS server for all children with just one click on the subnet detail page.

RFC 2317 (classless reverse DNS delegation)

For IPv4 subnets smaller than /24 (between /25 and /31), RFC 2317-style classless reverse DNS delegation can be enabled on the subnet configuration page. This is useful when the upstream provider has delegated reverse DNS authority for a sub-/24 block to your own RDNS server.

When enabled, PTR records for the subnet are stored in a RFC 2317 zone rather than the parent /24 zone. If the zone does not yet exist on the RDNS server, it is created automatically when the first PTR record is set.

The option is shown on the subnet configuration page when:

The subnet is an IPv4 subnet with a CIDR between /25 and /31.
A PowerDNS RDNS server is assigned to the subnet.