DHCP is what it is

In this article, I'll tell you that it's DHCP, explaining how to enable DHCP and how to configure DHCP on an existing network. Many of us are confronted with the term " DHCP " when confronted with router settings or network connections. Correct setting of this protocol is an important

factor of the computer network, and knowledge of its specificity is a necessary element in the baggage of an experienced PC user.

DHCP what is it


Technology Table of Contents

  • 1 What is DHCP
  • 2 When DHCP
  • appeared 3 How DHCP works
  • 4 Using DHCP in the local area network
  • 5 Using DHCP on the Internet
  • 6 Limiting DHCP
  • 7 Advantages and disadvantages of
  • 8 Conclusion

What is thisDHCP

DHCP ( Dynamic Host Configuration Protocol abbreviation) is a technology designed to automatically assign IP addresses to network devices. Many system administrators prefer to use DHCP instead of manually assigning IP addresses to network computers, while DHCP is also used to configure a subnet mask, gateway, and DNS servers.

DHCP what is it


Works How DHCP

Appears When the DHCP protocol was introduced in 1993, it was developed by a group of DHC WG experts, and the full description of the protocol was received only in the spring of 1997 in a document called RFC 2131. Today, this technology has the status of the previousthe standard

DHCP technology was not the first in the category of its kind, the work with IP-addresses was practiced before. In this case, the previous schemes had a number of shortcomings, among which highlighted the impossibility of dynamically obtaining IP-addresses and a small number of transmitted parameters. Needed a more advanced mechanism that would work with multi-segment networks, did not need a DHCP server for each subnet, would not conflict with existing network protocols, was able to serve BOOTP-clients, and also supported the automatic assignment of parameters of newly connected devices. DHCP technology allowed to meet all these queries( How to connect your computer to your computer via USB, Wi-Fi).

DHCP what is it

Data Transfer between Server and Client


Works The DHCP environment requires two constituent elements, a DHCP server and a DHCP client.

  • The first element( DHCP) sets the required network configuration parameters, assigns and updates addresses for joining or leaving the network of devices.
  • Another( DHCP client) connects to the network, receives from the configuration server, and starts to work. The set of DHCP parameters includes the range of available IP addresses, the corresponding subnet mask, the network gateway and the name for the server addresses.

Devices that have an active DHCP protocol automatically receive the required settings from the DHCP server. All most used network devices( telephones, computers, game consoles, etc.) support DHCP, have DHCP and all operating systems that are currently popular.

What is DHCP and how it works can be viewed on the video:

Using DHCP on the

local area network. Home network equipment( broadband routers) have DHCP support for easy connection of computers to a local area network( LAN).Using DHCP eliminates the need for the home administrator to personalize IP settings for each computer. Routers available in the routers allow you to enable or disable DHCP, as well as routers there are a number of options that should be activated in parallel with activating DHCP.

To configure DHCP in the home network, do the following:

  • log in to the router as an administrator( login and password are usually admin);
  • find the DHCP configuration inside the router console;
  • select DHCP option;After activating DHCP,
  • will select the range of IP addresses for local clients( for example, from to router will usually tell you the source address, the subnet mask, and the DHCP server address list can be distinguished from all possible);
  • select the required IP-lease time - this parameter shows the time the particular IP address is saved when the device is turned off( when the latter is not online).When the device connects to the network again, it will automatically receive an IP address reserved for it.
  • Enabling DHCP on a PC:

  • right-click on the network connection icon( right below);
  • choose a network management center;
  • then click on "connection on a local area network" or "wireless network connection";
  • in the menu select "properties";
  • press twice on the Internet protocol version 4;
  • will activate points on the reverse of the automatic receipt of IP-address and DNS;
  • press "OK".
  • Using DHCP on the Internet

    ISPs typically use DHCP to assign public IP addresses to their clients. Since traditional( I4) addresses are currently a scarce resource, each provider has a limited number of such addresses and should distribute them to their clients. DHCP allows providers to re-assign addresses to different users, depending on who is online, at a certain time.

    DHCP what is it

    DHCP server

    Also, ISPs can provide addresses to their personal DNS servers via DHCP for their users.

    Restricting DHCP

    Both devices( client and network gateway) must support DHCP and activate the operation of this protocol. However, the DHCP server does not recognize the device by which manually set the IP address within the range of the specified IP addresses of the server. This situation usually results in IP address conflicts and network failures.

    Advantages and disadvantages

  • To connect to a network, a computer or any other device must be configured properly. Since the use of DHCP has enabled automatic configuration of the configuration, virtually every device can be easily connected to the network, including computers, switches, smartphones, prefixes and so on;
  • The specificity of the operation of the dynamic protocol virtually eliminates the probability that the two devices will receive the same IP address, which often happens in the situation of manual set of statistical IP;
  • Using DHCP greatly simplifies the network configuration for administrators, due to the automatic distribution of addresses to the server.
  • Because IPs are installed automatically, devices can freely switch between different networks without having to manually register all the parameters;
  • for a variety of network devices( such as network printers) is a rather impractical looking constant change of IP for them. Therefore, for such devices it is better to store the statistical IP address;
  • same thing applies to cases where you have a permanent remote access to your computer using special programs linked to a particular IP address. For this access you will need a statistical IP, not a dynamic IP.
  • Conclusion

    DHCP - What is it? Using the DHCP protocol has greatly facilitated network operations. Now there is no need to customize each device individually, prescribe the necessary parameters and fear the possible conflict of devices. The DHCP server will do everything for you; it is important to configure the router correctly, and enable dynamic addressing support on your PC and other devices. Usually, after such settings, you only have to enjoy the stable operation of the network you are using.