If they are both DA servers use Multi Server option for the DNS servers. Then you will only have ns1 and ns2 serving both server1 and server2

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1) What would be the correct DNS settings to have the second server act as a fail over should the first server go down?

A small intro about the company, CloudCone, LLC is a Cloud Hosting Services Provider that provides Managed hourly billed cloud virtual private servers, AnyCast DNS, and high-performance bare metal ded

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Reverse DNS will resolve regardless of the state of your server. They have have TTL for the reverse DNS record set at 1 hour in which case even if you change the hostname, it may take up to an hour fo

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ask support to update reverse dns to your site.

Reverse DNS is irrelevant and likely the root of your miscommunication.

Have you put in a ticket to update your reverse DNS record? DCs are notoriously slow in updating those.

It's not just the hosting providers who won't work with them. Supposedly it's also credit card companies, payment processors, email providers, DNS providers etc.

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Thank you for respond, but I will not use the ns of each domain. I planned to use a whitelabel dns for all my domain.

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usage: Dns (iodine) and a uptime monitor

I added A and AAAA record to point to your dns1 and dns2 IP address, but porkbun won't let me change into my whitelabel dns, it only accept yours, mixing it with yours also unavailable.

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