Quote:
Originally Posted by fris
depends where the 4 dns are. if the first two are aws and there is an outage. the 2nd group will be of use.
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This above. Also you can have more nameservers but if they are on same server no benefit at all as if server goes down all nameservers are down as well. By design you must use minimum 2 nameservers (ns1 / ns2) registered under your domain.
You can also have them both on same IP but no benefit at all as if DNS software in use is on same server and server goes down all nameservers are down as well.
It would be best practice to have ns1/ns2/ns3 ... on different servers on different IPs in different datacenters because of
redundancy. All nameservers query each other and copy records for every domain that use them.
If I may suggest to you stop using nameservers on your own server/hosting and start to use free version of CloudFlare only for DNS purpose, here is a guide
https://www.cnewcomer.com/use-cloudf...-hosting-only/ . You can disable their cache and proxy and use only DNS and it is a very good third party DNS.
Also in case of some attack you can quickly enable their proxy and use their WAF firewall, many benefits of using CF as DNS provider and it is all cover under their Free Plan.