Nameservers is unreachable
I would appreciate any answer and help regarding DNS, nameservers and port 53
At the moment I have my own DNS and namesrevers are pointed to my domain, also I have Linode with 10 sites on it.
I've bought two more IP addresses on Linode.
My nameservers are directed to the following addresses
The thing is that when I test DNS, it gets the result that the other two addresses are not available, while only the first one is available with the address ns1.example.com
I also tried to open port 53, but hopelessly.
The thing is, if I install aaPanel, for example, it opens port 53, but my IP addresses are still unavailable.
I would appreciate any kind of help around this problem.
Thanks a lot!