What is DHCP (Dynamic Host Configuration Protocol)?

What is DHCP (Dynamic Host Configuration Protocol)?

Even though there are now a number of network management protocols, DCHP is still one of the most widely used choices. Dynamic Host Configuration Protocol, or DCHP, automates the frequently difficult process of configuring or establishing the devices on IP networks. The main goal is to provide network services like NTP, DNS, and other TCP or UDP-based communication protocols on the devices.

This protocol is used for dynamically configuring or altering the configuration settings of web servers. Each device on your network will be able to communicate with other IP networks once DHCP assigns each device on your network the necessary network setup parameters.

Of course, these options also include the default routers, DNS servers, IP addresses, and netmasks. Additionally, DHCP has client-server architecture, like the majority of network management protocols. It is an essential part of the DDI solution, which also includes DNS-DHCP-IPAM, and is an improved version of the outmoded BOOTP.

DHCP Overview

As a network management protocol, DHCP does away with the necessity for network administrators to manually configure network devices. The configuration settings are immediately distributed to computers and other network devices. It has two parts: a client instance and a server instance. The network center that is deployed centrally serves as the server side, while the individual computers or other devices act as the client instances.

This protocol specifies how the gadgets talk to one another both locally and between networks connected via the internet. An example of how a DHCP server handles IP settings is by automatically and dynamically supplying IP addresses or other configuration parameters to devices within its local network.

It should be noted that the configuration options provided by DHCP are only valid for specific amounts of time. The validity term is referred to as the DHCP lease time, while this duration is known as the DHCP lease. Once the lease expires, a client will no longer be able to use the associated IP address or parameter. It follows that they must halt any connectivity with the network.

The predetermined DHCP lease renewal cycle still allows consumers to ask for a lease rent extension. Device IP address allocation is reliable and automatic thanks to the renewal procedure.

DHCP works and usage

A client-server protocol, DHCP unquestionably has both elements. Thus, the DHCP client software automatically broadcasts a query asking for a certain piece of information whenever a device tries to establish a connection to a network.

This request is delivered to the DHCP server. Additionally, it examines and replies to the client inquiry because it controls a collection of IP addresses and other data related to the client configuration, including domain names, default gateways, time servers, and name servers.

Any legitimate information for the network may be included in the answer, including past administration setup, a specified particular address, or both. When DHCP clients boot up and periodically before it expires, they will ask for or check this information.

Ideally, you can set up DHCP on both little home networks and big multilevel networks with many of servers. When assisted by the DHCP relay agents at the routers, a single server can still provide services to huge networks with several links.

The most common DHCP usage scenarios are as follows:

dhcp conf file

Initial Client Connection

A client computer or device sends a request or query to the DHCP server in order to obtain an IP address and other configuration parameters.

IP Usage Extension

In this case, the client asks the DHCP server for an extension to use the IP address and other setup settings. When the lease time expires, this scenario is helpful.

Client Connection Following a Reboot

The client asks for authorization to use the same IP address and settings as before the reboot.

Client Disconnection

The client will eventually ask the server to relinquish the supplied IP address and parameters, regardless of the scenario they used to join. The communication would likewise terminate in this circumstance.

Example of DHCP

Linux users should be able to launch a DHCP server using the dhcpd command. The server is prompted by this program to read the /etc/dhcpd.conf file, which contains all the information about the IP addresses that are currently available and other configuration data.

The following is an illustration of a configuration file:


DHCP seems to be a rather simple protocol. Implementing it, however, is somewhat complicated. You are introduced to DHCP in this article. We will go into greater detail in our upcoming articles to provide you a step-by-step tutorial on how to set up a DHCP client and server.

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