Setting up the "Secondary" service

As part of the Secondary service, four secondary DNS servers are provided. They are located in cities around the world to ensure high availability and the lowest possible response times. The service is available for both forward and reverse domains in any top-level domains, including IDN domains. Order the "Secondary" service.

In this article, we'll explain how the "Secondary" service works and how to set it up.

• How the "Secondary" service works
• Secondary service settings

How the "Secondary" service works

The "Secondary" service operates according to the following algorithm:

1. The DNS servers ns4-l2.nic.ru (or ns4-l3.nic.ru, ns4-l4.nic.ru, or ns4-l5.nic.ru depending on the domain level) send requests for zone assignments to the primary DNS server, whose IP address is specified in the service settings upon activation. If necessary, the IP address of the primary DNS server can always be changed.
2. If receiving a zone from the primary DNS server is impossible at some point, the requests will be repeated periodically for 4 calendar days.
3. If all DNS server requests are unsuccessful for 4 days, they are suspended for 4 calendar days.
4. The DNS server ns8-l2.nic.ru (ns8-l3.nic.ru, ns8-l4.nic.ru or ns8-l5.nic.ru depending on the domain level) sends requests for zone retrieval to the primary DNS server specified in the service settings. If it is impossible to receive the zone from the primary server, then the requests are sent to the server ns4-l2.nic.ru (ns4-l3.nic.ru, ns4-l4.nic.ru or ns4-l5.nic.ru depending on the domain level).

Secondary service settings

For the service to function, you must:

1. Specify the names of the provided DNS servers when delegating a domain.
2. Configure the primary and secondary DNS servers.

In the Secondary service settings, you must specify the IP address of the primary DNS server from which to retrieve the zone file for the domain. You must specify the following DNS server names when delegating domains:

• for second-level domains, such as domain.ru

• for third-level domains, such as domain.msk.ru

• for fourth-level domains, such as sub.domain.spb.ru

• for fourth-level domains, such as sub.domain.spb.ru

Allow zone transfers for the following IP addresses:

To ensure timely updating of the domain zone on the Secondary service servers, it is necessary to configure the primary DNS server to send notify.

For 2nd level domains:

For 3rd level domains:

For 4th level domains:

For 5th level domains:

If the sending of notify is not configured on the primary DNS server, the changed domain zone on the servers ns4-l*.nic.ru, ns8-l*.nic.ru will be updated in accordance with the value of the Refresh parameter in the SOA record, but not less than in 1 hour.