Wednesday, February 18, 2009

Allows DnsSuffix Appending To Unqualified Multi-Label Name Queries Group Policy

"Allows Dns Suffix Appending To Unqualified Multi Label Name Queries" Group Policy determines appending suffixes to an unqualified multi-label name if the original name query fails.

A domain name containing dots, but not terminated by dot is called an unqualified multi-label name, for example "". A fully qualified multi label name will have a terminating dot, for example "".

If this policy is enabled, if the original multi label name query fails, dns suffixes are appended to an unqualified multi-label name.
For example, an unqualified multi-label name query for "" will be queried by the DNS Client first. If the query succeeds, the response is returned to the client. If the query fails, the unqualified multi-label name is appended with DNS Suffixes configured for the computer for queries. These suffixes can be derived from a combination of the local DNS Client's primary domain suffix, a connection-specific domain suffix and/or DNS Suffix Search List.

For example, if the local DNS Client receives a query for "", and a primary domain suffix is configured as "", with this setting the DNS Client will send a query for ""

To enable the policy, do the following
1. Open group policy editor using the command gpedit.msc.

2. In the console tree, browse to the node Computer Configuration -> Administrative Templates -> Network -> DnsClient, righ click on policy "Allows DnsSuffix Appending To Unqualified Multi-Label Name Queries Group Policy" and click properties.

3. In the properties dialog, check "Enabled" button, click apply and click OK button.

If the policy is disabled, then no suffixes are appended to unqualified multi-label name queries if the original name query fails.

If you do not configure this setting, computers will use their local DNS Client configuration to determine the query behavior for unqualified multi-label names.


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