Nameservers is unreachable

Hello,

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

ns1.example.foo
ns2.example.foo
ns3.example.foo

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!

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