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Active Directory Domain: MyCompany.com
Host name: MyComputer
Primary DNS suffix –MyCompany.com
Full computer name : MyComputer.MyCompany.com
Public Network
10BaseT
Internal Backup Network
100BaseT
DNS Names:
MyComputer.MyCompany.com
MyComputer.example2.com
Adapter-specific DNS suffix: example1.com
DNS Names:
MyComputer.MyCompany.com
Adapter-specific DNS suffix: example2.com
MyComputer.example1.com
In the picture above, a machine with the MyComputer Host name is joined to the
MyCompany.com. AD domain. Its primary DNS suffix is also set by default to
MyCompany.com.
The first adapter, which is being used for public access, is configured with the
example1.com. DNS suffix. The second adapter, which is used exclusively for
backups, has the example2.com. DNS suffix. The machine, therefore, can be
accessed publicly through the first adapter using the MyComputer.example1.com.
DNS name. For backup purposes the same machine can be accessed through the
second adapter using the MyComputer.example2.com. DNS name.
Integrating ADS with Existing DNS Structure
In order for a DNS server to be able to support the Active Directory it is required to
support the SRV records and it is recommended to support the dynamic updates, as
described in the RFC 2136.
When integrating ADS into an existing DNS infrastructure, the decision needs to be
made whether the Active Directory namespace will join, or overlap the existing DNS
namespace.
If there is no overlap, you can delegate a new Windows 2000 DNS namespace from
the existing DNS structure. When a DNS namespace is delegated off an existing
DNS tree, the DNS server that owns the zone file for the newly delegated
namespace, and becomes the primary master for that namespace. The DNS zone
name, that has been delegated, should correspond to the ADS root domain. This
approach is not required, but recommended if you want to use the benefits of the
Windows 2000 DNS server. You may continue using the existing DNS server
without delegating the Active Directory namespace as long as current DNS servers
support the SRV records and the dynamic updates.
If the overlap is inevitable, then the approach you should take depends on whether
the existing DNS tree is implemented using Windows NT 4.0 DNS, or a non-
Microsoft product.
Windows 2000 White Paper
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