DNS Server Stops Using Round Robin for Host Name Resolution
ID: Q177883
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The information in this article applies to:
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Microsoft Windows NT Server version 4.0
-
Microsoft Windows 2000 Server
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Microsoft Windows 2000 Advanced Server
IMPORTANT: This article contains information about editing the registry.
Before you edit the registry, make sure you understand how to restore it if
a problem occurs. For information about how to do this, view the "Restoring
the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key"
Help topic in Regedt32.exe.
SYMPTOMS
After you apply the latest Dns.exe, your Microsoft Windows NT Domain Name
Service (DNS) server no longer responds to queries in a round robin
fashion.
For additional information, please see the following articles in the
Microsoft Knowledge Base:
ARTICLE-ID: Q159310
TITLE : Updated Version of Dns.exe Fixes Several Problems
ARTICLE-ID: Q168321
TITLE : Creating a DNS Record for a Host That Has 2 or More IP Addresses
CAUSE
The latest version of Dns.exe for Windows NT server introduces a new
feature, LocalNetPriority, that attempts to return Host resources that are
local to the requestor instead of merely responding round robin.
RESOLUTION
By default, this feature is enabled and normal round robin responses will
not occur. To return to round robin responses, you will need to use the
following steps to disable the LocalNetPriority setting:
WARNING: Using Registry Editor incorrectly can cause serious problems that
may require you to reinstall your operating system. Microsoft cannot
guarantee that problems resulting from the incorrect use of Registry Editor
can be solved. Use Registry Editor at your own risk.
For information about how to edit the registry, view the "Changing Keys And
Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete
Information in the Registry" and "Edit Registry Data" Help topics in
Regedt32.exe. Note that you should back up the registry before you edit it.
- Start Registry Editor (Regedt32.exe or Regedit.exe).
- Go to the following subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters
- Create a new value using the following information:
Value Name: LocalNetPriority
Data Type : REG_DWORD
Data : 0 (0 = disabled, 1 = enabled)
NOTE: This value does not exist by default.
- Stop and restart the Microsoft DNS server service.
MORE INFORMATION
The DNS server will attempt to offer the "best-fit" address in response to
a DNS query. This best-fit is one that is determined to be on the same
subnet as the requesting DNS Client.
The classfull address is used to determine if the record and the querying
DNS Client are on the same subnet. This means only the first octet will be
used for class A addresses, the first two octets for class B, and the first
three octets for Class C addresses. If you have subnetted your address
space, this may have a derogatory effect on round robin load balancing.
Additional query words:
Keywords : kbnetwork nthowto ntnetserv NTSrv
Version : WINDOWS:2000; winnt:4.0
Platform : WINDOWS winnt
Issue type : kbprb