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What is a DNS (Domain Name System) forwarder?

Answer»

A DNS forwarder is a DNS server that FORWARDS DNS queries for external DNS names to DNS servers outside the network. A forwarder is used with a DNS server when it receives DNS queries that cannot be resolved quickly. Therefore, it forwards these requests to external DNS servers for resolution. 

A DNS server that is configured as a forwarder behaves differently than a DNS server that is not configured as a forwarder. 

The DNS server behaves as FOLLOWS when configured as a forwarder: 

  • When the query is RECEIVED by the DNS server, it resolves it using a cache.
  • If the DNS server is not able to resolve the request, it forwards it to another DNS server.
  • If the forwarder is not AVAILABLE, it tries to resolve the query using a root hint.


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