Resolution Using a DNS Resolver Cache

Hi Mahir,

Private Root Hint server IPs are configured when the network is completely isolated from public networks. For example, Military networks,classified networks etc.

For the networks connected to Public internet, there is no need for defining private root hint servers as public root hint servers do the job pretty well.

Here are the list of default Root Hint servers:

https://www.iana.org/domains/root/servers

Based on your problem description, I think, the DNS resolver you are building is not for air-gap or classified networks which are disjointed from public internet.

If that is true, you need not configure root hint servers and leave it blank so it uses public root servers as it should.

Moreover, when you query for a public domain name, and network is connected to public internet in any way, you can only get a Authoritative answer from a public source(IP) .

Let me know if it is not clear enough.

Regards,

Nag