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How can I ensure that the DNS resolver uses only results from queried DNS servers?
John Savill
October 22, 2002
1 Min Read
A. By default, if a client requests name resolution, the client will accept any response with the correct query ID, regardless of where the response is from. This behavior could lead to security problems if a rogue process that deliberately returns incorrect information exists on a system. To force the DNS resolver to match the source IP address of the response with the DNS servers that the DNS resolver queried, perform the following steps:
Start a registry editor (e.g., regedit.exe) on each client machine.
Navigate to the HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesDnscacheParameters registry subkey.
From the Edit menu, select New, DWORD Value.
Enter the name QueryIpMatching, then press Enter.
Double-click the new value, set it to 1, then click OK.
Close the registry editor.
Reboot the machine for the change to take effect.
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