Basic knowledge about DHCP (1)

DHCP is short for Dynamic Host Configuration Protocol. It is a type of TCP/IP Protocol cluster and is mainly used to assign Dynamic IP addresses to network clients. These allocated IP addresses are a set of IP addresses reserved by the DHCP server in advance, and they are generally consecutive IP addresses.

Understanding DHCP Service

When using DHCP, you must have a DHCP server on the network, while other machines execute DHCP clients. When the DHCP client sends a message requesting a dynamic IP address, the DHCP server will provide an available IP address and subnet mask to the client based on the configured IP address.

1. Advantages of DHCP

DHCP enables the server to dynamically provide IP addresses for other servers in the network. By using DHCP, you do not need to set or maintain static IP addresses for any server except DHCP, DNS, and WINS servers in the Intranet. Using DHCP can greatly simplify the configuration of client TCP/IP, especially when some TCP/IP parameters change, such as the IP address and subnet mask changes caused by large-scale network reconstruction.

A DHCP Server is a computer running Microsoft TCP/IP, DHCP Server software, and Windows NT Server. a dhcp client is a TCP/IP host that requests TCP/IP configuration information. DHCP uses the client/server model. The network administrator can create one or more DHCP servers that maintain TCP/IP configuration information and provide it to the client.

The IP address database on the DHCP server contains the following items:

◆ Valid configuration parameters for all clients on the Internet.

◆ The valid IP address specified for the client in the buffer pool and the reserved IP address manually specified.

◆ The lease time provided by the server, that is, the time available for the specified IP address.

Configuring a DHCP server in the network has the following advantages:

◆ Administrators can specify TCP/IP parameters for common and specific subnets for the entire Internet, and define the parameters for clients that use reserved addresses.

◆ Provides secure and trusted configurations. DHCP avoids configuration errors caused by manually entering numbers on each computer and prevents Computer Configuration address conflicts on the network.

◆ Using a DHCP server can greatly reduce the configuration overhead and reconfigure the computer time on the network. The server can configure all additional configuration values when assigning an address lease.

◆ The client does not need to manually Configure TCP/IP.

◆ When the client moves between subnets, the old IP address is automatically released for reuse. When the client is started again, the DHCP server will automatically reconfigure the TCP/IP for the client.

◆ Most routers can forward DHCP configuration requests. Therefore, no DHCP server is required for each subnet on the Internet.

Note:

If you want to use a DHCP server to support subnets that span multiple routers, the router may need hardware upgrades. The vro must support RFC 1533, 1534, 1541, and 1542.