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providing the draft copy here.
SUMMARY
=======
The goal of this article is to provide steps to ensure that
the forest-wide locator records under _msdcs.forestname are available
on every
DNS server in the forest. This scenario is applicable when Windows 2000
domain
controllers running the DNS Server service are upgraded to Windows
Server 2003.
MORE INFORMATION
================
When a server running Windows 2000 Server is promoted as
the first domain controller in a new Active Directory forest, the Active
Directory Installation Wizard creates a DNS forward lookup zone named
after the
forest root domain, and a subdomain named _msdcs.forestname. For
example, if
your Active Directory forest name were reskit.com, then the wizard
would create
the DNS zone ?reskit.com? and the subdomain ?_msdcs.reskit.com? and
store the
subdomain with the zone for the domain. The domain zone hosts DC
locator DNS
resource records for each Active Directory domain controller in the
domain. The
_msdcs.forestname subdomain hosts DC locator DNS resource records for
all
domain controllers in an Active Directory forest. It is also used to
locate
domain controllers that have specific roles in the Active Directory
domain or
forest, as well as to locate a domain controller by GUID when a domain
has been
renamed.
When the DNS root domain of a new Active Directory forest is
created on a Windows Server 2003 domain controller, a DNS zone is
automatically
created for the _msdcs.forestname and stored in the forest-wide DNS
application
directory partition, which replicates to all Windows Server 2003 domain
controllers in the forest running the Windows Server 2003 DNS Server
service.
However, if you upgrade from Windows 2000 Server to Windows Server
2003, the _msdcs.forestname zone will be stored on your Windows Server
2003
domain controller in one of the following ways:
- Case 1: An Active Directory-integrated _msdcs.forestname zone is
stored in your root domain and secondary _msdcs.forestname zones are
stored in your child domains (if present).
- Case 2: If your existing (Windows 2000 Server) _msdcs.forestname was
a subdomain of the root domain DNS zone, then the _msdcs.forestname
domain will remain a subdomain of the forest root DNS zone.
Microsoft recommends that the DNS records for the
_msdcs.forestname domain name always be placed in a zone for the
_msdcs.forestname domain name and stored in the forest wide DNS
application
directory partition to ensure forest-wide availability.
Case 1: Transitioning the domain wide _msdcs.forestname zone to the
forest-wide DNS application directory partition
1. In the DNS console, right-click the _msdcs.forestname zone, and then
click Properties.
2. On the General tab, note the current zone replication type, and then
click Change.
3. Select the forest-wide replication scope for the zone.
4. Delete any secondary _msdcs.forestname zones that are stored in your
child domains.
Notes:
- To perform this procedure, you must be a member of the DnsAdmins or
the Domain Admins group in Active Directory, or you must have been
delegated the appropriate authority. As a security best practice,
consider using the "Run As" command to perform this procedure.
- When the new forest?wide zone is propagated to the application
partition of all DNS servers in the forest, then you should delete the
previous secondary zone. To delete the zone, in the DNS console,
right-click the zone, and then choose Delete.
- While the zone replication type change is made once per forest, the
secondary zones must be deleted from each DNS server individually.
Case 2: Transitioning Windows 2000 _msdcs subdomain to a Windows Server
2003 zone stored in the forest-wide DNS application directory partition
The following procedure assumes that the DNS zones for
the Active Directory forest root domain were created during the
promotion of a
Windows 2000 domain controller, and that all domain controllers in the
forest
root domain hosting the DNS server have been upgraded to Windows Server
2003.
The procedure includes the following high-level steps:
1. Configuring the primary DNS server setting in the network
connections of all domain controllers in your forest with the IP
address of a single root domain controller.
2. Creating the _msdcs zone for the Active Directory forest name, and
storing the _msdcs.forestname zone in the DNS forest wide application
directory partition.
3. Forcing replication.
4. Deleting the old _msdcs subdomain.
5. Returning the primary DNS server setting in the network connections
of all domain controllers in your forest to their previous
configuration.
To transition the _msdcs subdomain to a zone stored in the
forest wide DNS application partition:
- By default, only members of the Enterprise Admins group can create a
DNS application directory partition
- When changing the storage of a zone from the domain partition to an
application directory partition, such as following the promotion of a
new Windows Server 2003 domain controller in an existing Windows 2000
domain, the domain controller holding the domain naming master role
must be running Windows Server 2003 for the DNS application directory
partitions to exist. If you receive an error when changing the storage
of a zone from the domain partition to an application directory
partition, transfer the domain naming master role to a domain
controller running Windows Server 2003, create the default DNS
application directory partitions, and try again.
1. On all domain controllers in the forest, perform the
following network connection configuration:
a. Click Start, click Control Panel, click Network and Internet
Connections, and then click Network Connections.
b. Right-click the network connection you want to
configure, and then click Properties.
c. On the General tab (for a local area connection), click Internet
Protocol (TCP/IP), and then click Properties.
d. Confirm that Use the following DNS server addresses is enabled.
e. In Preferred DNS server, record the existing IP address.
f. In Preferred DNS server, type the IP address of a single root domain
controller
running the DNS Server service.
g. Click OK.
Note: For large deployments, you may want to create a script to configure
the IP address of a single root domain controller as the preferred DNS
server setting on all domain controllers.
Important: You must use the same IP address of a single root domain
controller for all domain controllers in the forest. The purpose of this
configuration is to ensure that all domain controllers in the forest
register their DNS resource records in copies of the same _msdcs.forestname
zone.
2. Log onto the Windows Server 2003 root domain controller using an
account that is a member of the Enterprise Admins group.
3. Verify that a Windows Server 2003 domain controller holds the domain
naming master role.
4. Verify that all DNS servers that currently host the
_msdcs.forestname subdomain in primary zones are running Windows Server
2003.
5. Start the DNS console (start ->run -> DNSMGMT.MSC).
6. In the DNS console, right-click Forward Lookup Zones, and then click
New Zone.
7. In the New Zone Wizard, on the Zone Type page, click Primary zone,
and enable the Store the zone in Active Directory checkbox.
8. On the Active Directory Zone Replication Scope page, click To all
DNS servers in the Active Directory forest forestname.
9. On the Zone Name page, in Zone Name, enter _msdcs.forestname.
10. Complete the wizard by accepting all default options. The zone is
created and the Net Logon service populates the zone with the
_msdcs.forestname resource records for the local domain controller.
11. The zone will now replicate to all other DNS servers in
the replication scope using the default replication schedule, or you
can force
replication. To force replication, you can use Active Directory Sites
and
Services, or the Support Tool repadmin:
- To use Active Directory Sites and Services:
a. Open Active Directory Sites and Services.
b. In the console tree, click NTDS Settings for the server from which
you want to force
replication.
c. In the details pane, right-click the connection
over which you want to replicate directory information, and then
click Replicate Now.
- To use the Support Tool repadmin.exe:
a. With the Support Tools installed, open a Command Prompt.
b. Type " Repadmin /syncall" . This will synchronize
all directory partitions.
12. The old _msdcs subdomain does not have to be deleted from the zone
where is was created before you upgraded because the DNS Server service
will use the new _msdcs zone to answer any queries for names beginning
with _msdcs. Microsoft recommends that you delete the old _msdcs
subdomain to maintain a more orderly DNS database.
13. To delete the old _msdcs subdomain, open the DNS console.
14. In the console tree, expand the zone containing the _msdcs
subdomain.
15. Right-click the _msdcs subdomain folder, and then click Delete.
16. Once replication is confirmed for all domain controllers
in the forest, perform the following network connection configuration
on all
domain controllers in the forest:
a. Click Start, click Control Panel, click Network and Internet
Connections, and then click Network Connections.
b. Right-click the network connection you want to
configure, and then click Properties.
c. On the General tab (for a local area connection), click Internet
...
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