Configuration of DNS servers under Windows 2000

If users use Windows SQL Server as the operating system of a computer, they can configure the computer as a Web server, an IIS server, an FTP server, a DNS server, A variety of servers, such as a DHCP server and a WINS server, to provide a service to clients in a network. Of the most important and basic three services provided by Windows Server servers is the domain name service, the service that converts the NetBIOS computer name to the corresponding IP address, and the service that dynamically assigns IP addresses to clients entering the network. Their main function is to transform and parse the IP address that the computer can recognize with the computer address and name of the type such as www.sina.com or Jace (computer name) that people use in the real world. These three services are performed by DNS servers, DHCP servers, and WINS servers respectively. This chapter describes how to create and configure DNS servers, DHCP servers, and WINS servers and their associated knowledge, based on the important role of these three servers in the overall network connection.

On a large Internet network, each computer (whether it is a server or a client) has its own computer name. This easily identifiable name enables network operations such as easy access between network users and connections between clients and servers that store information resources. However, the real connection between the computer hardware in the network is not through the familiar name of the computer, but by the individual IP addresses of each computer. Because the computer hardware can only recognize the binary IP address. Therefore, there are many domain name servers on the Internet that are working to convert computer names to corresponding IP addresses in order to connect computers on your network. The visible DNS server plays an important role in the Internet, and this section provides an introduction to the Domain Name service and how to configure and administer DNS servers.

What is Domain Name service

In the computer network, the host identifier is divided into three categories: name, address and path. And the computer in the network address is divided into IP address and physical address, but the address is not easy to remember and understand. To provide an intuitive host identifier to the user, the TCP/IP protocol provides domain name services (DNS)

The introduction of DNS is closely related to the introduction of hierarchical naming mechanism in TCP/IP protocol. The so-called hierarchical naming mechanism refers to the inclusion of structural information in the name, which itself is hierarchical. For example, DNS is composed of root and tree structures (as shown in Figure 10-1).

The process of naming a hierarchy begins with the root (root) down the arrow, selects each name corresponding to each label in each place, and then concatenates the names to form a unique name that represents the host. For example, in Figure 10-1, the label of each dot in the Internet is the corresponding relationship to the organization as shown in table 10-1.

Specifically, a network is a part of the entire WAN, composed of several networks, the geographical or organizational relationship is very close, the wide area network to abstract them into a point to deal with, the network is divided into several administrative groups, under the group is the host, therefore, the general format of DNS is:

Local host name? group name? Dot Name

The DNS server is responsible for converting the host name to the IP address, along with the domain name. This functionality is critical to achieving network connectivity. Because when a client on a network needs to access a resource on a server, the client's users need only be in the "address" in the main Internet Explorer window In the text box, you can connect to the server by entering an address, such as the www.happy.com.cn type, that is known to the server in reality. However, the connection between computers on the network is accomplished through the unique IP address that each computer has on the network (the address is a numeric address, divided into two parts of the network address and host address), because the computer hardware can only recognize an IP address and not be able to recognize other types of addresses. This makes it possible for the DNS server to have a transformation between the user's easy to remember address and the address that the computer can recognize.

Although all network systems connected to the Internet use the DNS address resolution method, the domain name service has the disadvantage that all data stored in the DNS database is static and cannot be updated automatically. This means that when a new host is added to the network, the administrator must add the host DNS name (for example, www.happy.com.cn) and the corresponding IP address (for example, 147.23.234.6) to the database. This is difficult for larger network systems. However, it is gratifying that Windows 2000 solves this problem by integrating DNS with WINS. When a DNS server cannot resolve the address of a client computer, it passes the request to WINS when it is requested. If WINS has relevant information, it resolves the address and passes the message back to the DNS server. The DNS server then passes the information back to the customer who executed the connection request.