Policy

Specify address lookup behavior for DC locator ping

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.

Policy
Pack Microsoft Windows
Category System / Net Logon / DC Locator DNS Records
Policy ID 51c2bb69acee
Internal name Netlogon_AddressLookupOnPingBehavior

Registry

Copy registry mappings

HKLM\Software\Policies\Microsoft\Netlogon\Parameters\AddressLookupOnPingBehavior

Policy notes

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.

Related policies

Block NetBIOS-based discovery for domain controller locationDo not process incoming mailslot messages used for domain controller location based on NetBIOS domain namesDo not use NetBIOS-based discovery for domain controller location when DNS-based discovery failsForce Rediscovery IntervalReturn domain controller address typeSet Priority in the DC Locator DNS SRV recordsSet TTL in the DC Locator DNS Records