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What does "Disable Recursion" in DNS mean?
In the Windows 2000/2003 DNS console (dnsmgmt.msc),
under a server's Properties ->
Forwarders tab is the setting Do not use recursion for this domain. On the
Advanced tab you will find the confusingly similar option Disable recursion
(also disables forwarders). Recursion refers to the action of a DNS server
querying additional DNS servers (e.g. local ISP DNS or the root DNS servers) to resolve
queries that it cannot resolve from its own database. So what is the
difference between these settings?
The DNS server will attempt to resolve the name locally, then will forward requests
to any DNS servers specified as forwarders. If Do not use recursion for this domain
is enabled, the DNS server will pass the query on to forwarders, but will not
recursively query any other DNS servers (e.g. external DNS servers) if the
forwarders cannot resolve the query. If Disable recursion (also disables forwarders)
is set, the server will attempt to resolve a query from its own database only.
It will not query any additional servers.
If neither of these options is set, the server will attempt to resolve queries normally:
... the local database is queried ... if an entry is not found, the request is passed to any forwarders that are set
... if no forwarders are set, the server will query servers on the Root Hints tab to resolve
queries beginning at the root domains.
What is a "Single Label domain name" and what sort of issues can it cause?
Single-label names consist of a single word like "contoso". • Single-label DNS names cannot be registered by using an Internet registrar. • Client computers and domain controllers that joined to single-label domains require additional configuration to dynamically register DNS records in single-label DNS zones. • Client computers and domain controllers may require additional configuration to resolve DNS queries in single-label DNS zones. • By default, Windows Server 2003-based domain members, Windows XP-based domain members, and Windows 2000-based domain members do not perform dynamic updates to single-label DNS zones. • Some server-based applications are incompatible with single-label domain names. Application support may not exist in the initial release of an application, or support may be dropped in a future release. For example, Microsoft Exchange Server 2007 is not supported in environments in which single-label DNS is used. • Some server-based applications are incompatible with the domain rename feature that is supported in Windows Server 2003 domain controllers and in Windows Server 2008 domain controllers. These incompatibilities either block or complicate the use of the domain rename feature when you try to rename a single-label DNS name to a fully qualified domain name.
In the Windows 2000/2003 DNS console (dnsmgmt.msc),
under a server's Properties ->
Forwarders tab is the setting Do not use recursion for this domain. On the
Advanced tab you will find the confusingly similar option Disable recursion
(also disables forwarders). Recursion refers to the action of a DNS server
querying additional DNS servers (e.g. local ISP DNS or the root DNS servers) to resolve
queries that it cannot resolve from its own database. So what is the
difference between these settings?
The DNS server will attempt to resolve the name locally, then will forward requests
to any DNS servers specified as forwarders. If Do not use recursion for this domain
is enabled, the DNS server will pass the query on to forwarders, but will not
recursively query any other DNS servers (e.g. external DNS servers) if the
forwarders cannot resolve the query. If Disable recursion (also disables forwarders)
is set, the server will attempt to resolve a query from its own database only.
It will not query any additional servers.
If neither of these options is set, the server will attempt to resolve queries normally:
... the local database is queried ... if an entry is not found, the request is passed to any forwarders that are set
... if no forwarders are set, the server will query servers on the Root Hints tab to resolve
queries beginning at the root domains.
What is a "Single Label domain name" and what sort of issues can it cause?
Single-label names consist of a single word like "contoso". • Single-label DNS names cannot be registered by using an Internet registrar. • Client computers and domain controllers that joined to single-label domains require additional configuration to dynamically register DNS records in single-label DNS zones. • Client computers and domain controllers may require additional configuration to resolve DNS queries in single-label DNS zones. • By default, Windows Server 2003-based domain members, Windows XP-based domain members, and Windows 2000-based domain members do not perform dynamic updates to single-label DNS zones. • Some server-based applications are incompatible with single-label domain names. Application support may not exist in the initial release of an application, or support may be dropped in a future release. For example, Microsoft Exchange Server 2007 is not supported in environments in which single-label DNS is used. • Some server-based applications are incompatible with the domain rename feature that is supported in Windows Server 2003 domain controllers and in Windows Server 2008 domain controllers. These incompatibilities either block or complicate the use of the domain rename feature when you try to rename a single-label DNS name to a fully qualified domain name.
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