Policy
Specify address lookup behavior for DC locator ping
Windows 11 25H2
Policy overview
Key metadata and intent for this policy.
Supported OS tags: Windows10, Windows10RT, Windows11, Windows8, Windows81, WindowsRT, WindowsRT81, WindowsServer2012, WindowsServer2012R2, WindowsServer2016
This policy setting configures how a domain controller (DC) behaves when responding to a client whose IP address does not map to any configured site. Domain controllers use the client IP address during a DC locator ping request to compute which Active Directory site the client belongs to. If no site mapping can be computed, the DC may do an address lookup on the client network name to discover other IP addresses which may then be used to compute a matching site for the client. The allowable values for this setting result in the following behaviors: 0 - DCs will never perform address lookups. 1 - DCs will perform an exhaustive address lookup to discover additional client IP addresses. 2 - DCs will perform a fast, DNS-only address lookup to discover additional client IP addresses. To specify this behavior in the DC Locator DNS SRV records, click Enabled, and then enter a value. The range of values is from 0 to 2. If you do not configure this policy setting, it is not applied to any DCs, and DCs use their local configuration.
Registry values
How enabled and disabled states update the registry.
No explicit registry values are set for enabled or disabled states.
Policy elements
Inputs and configuration options exposed by this policy.
| Element | Type | Registry mapping | Constraints & behavior |
|---|---|---|---|
Address lookup behavior: ID Netlogon_AddressLookupOnPingBehaviorLabel | decimal | HKLM\Software\Policies\Microsoft\Netlogon\Parameters\AddressLookupOnPingBehavior Type REG_DWORD | Range: ? to 2 |
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