How to start dhcp server in linux

How to start the dhcp server in Linux: first use yum to install the dhcp server; then perform related configurations; finally use service to start the DHCP service normally.

DHCP (Dynamic Host Configuration Protocol, Dynamic Host Management Protocol) is a network based on UDP protocol and is limited to LAN The main purpose of the protocol is to automatically assign IP addresses to internal LAN devices or network providers. It is usually used in large LAN environments or when there are many mobile office devices in the LAN. The DHCP protocol can achieve centralized management and allocation of IP addresses.

The DHCP service program enables hosts in the LAN to automatically and dynamically obtain information such as IP addresses, subnet masks, gateway addresses, and DNS server addresses, and can effectively Improve address usage, improve configuration efficiency, and reduce management and maintenance costs.

Installation

# yum install dhcp

Configuration

There are only comment statements by default under /etc/dhcp/dhcpd.conf, need to refer to Download the template file
#mv /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf (my dhcp version here is 4.2.5, different versions have it Different)

The standard DHCP configuration file includes global configuration parameters, subnet segment declaration, address configuration options and address configuration parameters:

Determine the global configuration of the dhcpd service

Global configuration applies to the entire DHCP server and is usually placed at the beginning of the configuration file. It can be a configuration parameter or a configuration option. Commonly used global configuration parameters and options are as follows:

option domain-name, default search area. Specify the default search domain for the client when resolving host names. This configuration option will be reflected in the client's /etc/resolv.conf configuration file.

option domain-name-servers, DNS server address. Specify the DNS server address used when resolving domain names for the client. This configuration option will also be reflected in the client's /etc/resolv.conf configuration file. When multiple DNS server addresses need to be set, they should be separated by commas.

default-lease-time, default lease time. The unit is seconds, indicating the default time that the client can lease an IP address from the DHCP server.

max-lease-time, maximum lease time. The unit is seconds, indicating the maximum lease time allowed to be requested by the DHCP client. When the client does not request an explicit lease time, the server uses the default lease time.

ddns-update-style, dynamic DNS update mode. Used to set the DNS data dynamic update mode associated with the DHCP service. This parameter is rarely used in actual DHCP applications, so just set the value to "none".

Restart the server dhcpd, client network, you can see the client ip address.

Check the /var/lib/dhcpd/dhcpd.leases~ file on the server to know the lease time and other information:

Generally, the DHCP relay function is It is rarely used in daily work, or the router is responsible for the relay function, and it is rarely built with a Linux system.

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