One way to make your DNS infrastructure more resilient is by configuring a secondary name server. The forward lookup zone on a secondary name server can be set up in several ways, but one of the most effective is through a process called zone transfer.
In zone transfer, the primary name server sends a copy of its zone file to the secondary server. This allows the secondary server to have an up-to-date copy of the DNS information for your domain, so that it can respond to queries even if the primary server is unavailable. The secondary server can also be configured to periodically check for updates from the primary server, so that it always has the most current information.
To configure a forward lookup zone on a secondary name server, you will need to start by installing and configuring DNS software on the secondary server. Once the software is installed, you will need to configure the secondary server as a slave for the primary server's zone. This can usually be done through the DNS software's user interface or by editing the software's configuration files.
It's important to note that the exact steps for configuring a forward lookup zone on a secondary name server will vary depending on the DNS software you are using. If you are using a different DNS software, you will need to consult the software's documentation for instructions on how to configure.
Once you have configured the secondary server as a slave for the primary server's zone, you can test that the zone transfer is working properly by querying the secondary server for a record in the zone. If the secondary server returns the correct information, then you can be confident that the zone transfer is working as intended.
With a properly configured forward lookup zone on a secondary name server, you can rest assured that your DNS infrastructure will be more resilient and better able to withstand outages or other issues that may affect the primary server.