Understanding the Role of Forwarders

Forwarders are name servers that handle all iterative queries for a name server. In other words, if a server cannot answer a query from a client resolver, servers that have forwarders simply forward the request to an upstream forwarder that will process the iterative queries to the Internet root name servers. Forwarders are often used in situations in which an organization uses the DNS servers of an Internet service provider (ISP) to handle all name-resolution traffic. Another common situation occurs when Active Directory’s DNS servers handle all internal AD DNS resolution but forward outbound DNS requests to another DNS environment within an organization, such as a legacy UNIX BIND server.

In conditional ...

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