Avoid changing ns1 and ns2 IP's?

Hello,

The last 3 months because of some serious problems one customer changed dns IP's twice.
However, there is a need to move once again to a new dedicated box in a different provider and therefore new IP's for his ns1 and ns2.

I would like to ask, is there a way to avoid that in the future?
If I register for a dns service in a different company, can I have always my DNS there and does this will affect the way that cpanel manage domains etc?

I mean, if I add a domain via cPanel, how that domain will point to the 'outside' dns?

I am a little bit confused Avoid changing ns1 and ns2 IP's?

 

 

 

 

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