NotifyLevel

Article
09/26/2008

HKLM\SYSTEM\CurrentControlSet\Services\DNS\Zones\ zone-name

Data type	Range	Default value
REG_DWORD	0 \| 1 \| 2	Standard primary zones: 1 Active Directory–integrated zones: 2

Description

Determines which secondary servers the Domain Name System (DNS) master server notifies when zone information changes.

This entry lets you configure the DNS server to send change notices only to specified servers. Limiting the distribution of zone information is intended for security, but it also conserves processor time and prevents denial-of-service attacks (also known as SYN flooding ).

Value	Meaning
0	No notices. DNS does not notify secondary servers when zone information changes.
1	Notify only the name servers that are authoritative for the zone. Authoritative name servers are specified by NS (name server) records at the zone root.
2	Notify only the servers you specify. To create a list of servers that receive notices, use the Zone Properties Notify dialog box in the DNS console. The DNS console stores your list in the value of the NotifyServers entry. If NotifyServers does not appear in the registry or if its value is blank, DNS does not send notices.

Change method

To change the value of this entry, use the DNS console. Right-click the name of a secondary zone, click Properties, click the Zone Transfer tab, click the Notify button, and then select an option. Do not change this value by editing the registry. If you do, the changes will not be effective unless you restart the DNS server.

Activation method

DNS reads its registry entries only when it starts. You can change entries while the DNS server is running by using the DNS snap-in.

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