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Once ICANN delegates control over a top-level domain, it is the responsibility of the designated organization to maintain the domain and handle registrations. After an organization registers a domain name with one of these authorities, the organization controls the domain and can create subdomains within this domain without having to make a formal request. For example, if you register the domain cpandl.com, you can create the subdomains seattle.cpandl.com, portland.cpandl.com, and sf.cpandl.com without having to ask the registration authority for permission. Private namespaces aren t controlled by ICANN. You can create your own private namespace for use within your company. For example, you could use .local for your top-level domain. This keeps your internal network separate from the public Internet. You would then need to rely on Network Address Translation (NAT) or proxy servers to access the public Internet.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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In DNS, name resolution is made possible using a distributed database. The resource records in this database detail host name and IP address information relating to domains. It is the job of DNS name servers to store the DNS database and respond to queries from clients about the information the database contains. A portion of the DNS namespace that is controlled by a DNS name server or a group of name servers is referred to as a zone. Zones establish the boundaries within which a particular name server can resolve requests. On clients, it is the job of DNS resolvers to contact name servers and perform queries about resource records. Thus, the three main components of DNS are as follows:
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Resource records stored in a distributed database DNS name servers that are responsible for maintaining specific zones DNS resolvers running on clients
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These key components are used to perform DNS operations, which can consist of query operations, query replies, and DNS update operations. A basic query and reply work as shown in Figure 26-2. Here, a DNS client wants information from a DNS name server, so it sends a DNS query. The DNS server to which the query is sent checks its local database and forwards the request to an authoritative server. The authoritative server sends back a response to the local DNS server, and that response is forwarded to the client.
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Architecting DNS Infrastructure
1 DNS name query sent. 2 DNS server checks the local database. 3 DNS forwards request to authoritative server.
F26ws02
Response forwarded to the client.
Authoritative server sends a response.
Figure 26-2.
DNS query and reply.
As Figure 26-3 shows, things get a bit more complicated when a client requests the name of an external resource, such as a Web site. If you were on an internal domain and requested a resource on the public Internet, such as the IP address for the www.cpandl.com server, the DNS client on your computer queries the local name server as specified in its TCP/IP configuration. The local name server forwards the request to the root server for the external resource domain. This domain contacts the name server for the related top-level domain, which in turn contacts the name server for the cpandl.com domain. This authoritative server sends a response, which is forwarded to the client, who can then access the external resource.
Local name server Root name server
.com name server
CP&L name server
Client
www.cpandl.com
F26ws03
Figure 26-3.
Name resolution using the DNS tree.
Part 6: Managing Windows Server 2003 Networking and Print Services
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Microsoft Windows Server 2003 Inside Out As you can see, in a normal DNS configuration, if your DNS name server can t resolve a request, it simply forwards the request to another name server for resolution. This allows your organization s name servers to get internal DNS information and external DNS information on the public Internet. However, what if the domain you were trying to reach was a resource in another one of your own internal domains. In this case, you wouldn t want requests to be forwarded to a public DNS name server for resolution. The public DNS server would have no idea how to resolve the request. There are several ways to resolve this problem and one of these ways is to use conditional forwarding. By using conditional forwarding, you can tell your DNS name servers that if you see a request for domain XYZ, don t forward it to the public DNS name servers for resolution. Instead, forward the request directly to the XYZ name server which is the authoritative name server for the domain being looked up. This name server will then be able to reply to the query and the DNS lookup will be resolved. For more information on resolving name resolution problems and conditional forwarding, see the section entitled Secondary Zones, Stub Zones, and Conditional Forwarding later in this chapter.
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