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So I want to run a test with forwarding '' to 'and see how that works.

After deleting the extra A records, changeip returns 'there is nothing to change'. The changeip -checkhostname command reports an error. But I noticed this construction is confusing DNS. As for the forward and reverse DNS records, anything that expects to use secure network connections will want the host names to match.

As a test of this, you can shut down the DNS server, configure the OS X Server box to use the existing public DNS servers, and confirm DNS operations with sudo changeip -checkhostname or such. First, namebench checks the connection quality and makes adjustments for the connection condition. They should be on by default: Include global DNS servers Include best available regional DNS servers 3. Before running the benchmark check that these two options are on. The following sections present the most common uses of the command.Set to test both global and regional DNS servers. Use the nslookup command to perform DNS and reverse DNS searches and troubleshoot server-related problems. Install it by running: sudo dnf install bind-utils How to Use nslookup? On CentOS, Fedora, and Red Hat, nslookup is part of the bind-utils package. If you need to install it again on Ubuntu or another Linux distro featuring the APT package manager, install the dnsutils package: sudo apt install dnsutils

Nslookup comes preinstalled on all major operating systems. View hardware-related information about the host. View information about the DNS A address records. Specify the time allowed for the server to respond. Find all the important nslookup options in the following table.