Working with root hints and forwarders
In this section we will focus on how to configure root hints and forwarders for the DNS server that we have just installed. Before proceeding with that, let's learn a bit about root hints and forwarders. They are as follows:
Root hints: Each DNS server is authorized to provide responses to zones hosted on them. But what if the DNS server you are querying is not responsible for the DNS data you are looking for? In such cases, DNS uses the root hint servers to find the authoritative name servers for the domain you are looking for and provides you the results by contacting them. The DNS server should be able to talk to these root hint servers. The default root hint servers are placed on the Internet since your DNS server should have access to these root hints for resolution.
Forwarders: Using root hints for non-authoritative name resolution operations is not always possible. DNS servers in corporate environment may not be allowed to talk to root hint servers...
