Microsoft KB Archive/303811

= DNS Server Routes Queries to Root Name Servers in Addition to Forwarder =

Article ID: 303811

Article Last Modified on 3/1/2007

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APPLIES TO


 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q303811



SYMPTOMS
If a primary Intranet DNS server is configured to forward queries, it cannot resolve to the Internet service provider's (ISP) DNS server. A network capture may show the DNS server routing queries that it cannot resolve directly to the Internet instead of routing them only to the Forwarder.



CAUSE
In a standard DNS forwarder configuration, queries to the primary DNS server are handled in the following way:
 * When the primary Intranet DNS server receives a query that it cannot resolve, it routes the query to the Forwarder.
 * If the primary DNS server does not receive a response in a timely fashion from the Forwarder, it then attempts to route the query to the Internet Root Domain Name servers.

The difference between the queries is that the queries to the Forwarder are recursive and the primary DNS server queries are not.



WORKAROUND
To prevent Root Hint Servers from being queried, either configure the primary DNS server to be a slave forwarder (disable recursion) or delete the Root Name server entries.



STATUS
This behavior is by design.



MORE INFORMATION
For additional information, please reference RFC's 2136 and 2870.

Keywords: kbenv kbprb KB303811

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