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Editor to share with you how to use dhcp to get IP automatically under Linux. I believe most people don't know much about it, so share this article for your reference. I hope you can learn a lot after reading this article. Let's learn about it together.

Dhcp is a dynamic host setting protocol (Dynamic Host Configuration Protocol, DHCP), which is a network protocol of a local area network. It works with UDP protocol and has two main uses: automatically assigning IP addresses to internal network or network service providers to internal network administrators as a means of central management of all computers.

First use the ip addr command to get the ip address of the Linux server

Found that ens33 has no inet attribute

You need to configure the ip address to connect to Linux remotely.

Method 1: configure through nmtui

Enter the configuration interface

Edit a connection: set up a connection to add and delete network configuration

Activate a connection: activate a connection to enable disable network configuration

Set system hostname: setting hostname

Select Edit a connection and press enter.

Select ens33 and press enter.

Change IPv4 CONFIGURATION to Automatic, remove 192.168.1.100Accord 24 from Addresses, and then select ok

Select Back

Select ok

If you want the Nic configuration to take effect, you need to restart the network service and execute systemctl restart network.

An error occurred and the network service failed to restart

After looking up the information, it is found that the reason for the error is a conflict with the NetworkManager service, which is easy to solve, just shut down the NetworkManger service directly. Systemctl stop NetwrokManager stops the network management service and then executes systemctl restart network

In this way, dhcp is used to obtain the ip address automatically.

Execute ip addr, and the ip address has been obtained automatically.

Method 2: execute vi / etc/sysconfig/network-scripts/ifcfg-ens33

See the configuration information of the ens33 network card file

Configuration information explanation:

TYPE=Ethernet network card type: Ethernet

PROXY_METHOD=none proxy mode: closed statu

BROWSER_ONLY=no is just a browser (yes | no)

BOOTPROTO=none sets how the network card obtains the ip address (static | dhcp | none | bootp)

DEFROUTE=yes is set as the default route (yes | no)

Whether IPV4_FAILURE_FATAL=no enables IPV4 fatal error detection (yes | no)

Whether IPV6INIT=yes IPV6 initializes automatically

Whether IPV6_AUTOCONF=yes IPV6 is automatically configured

Whether IPV6_DEFROUTE=yes IPV6 can be the default route

IPV6_FAILURE_FATAL=no does not enable IPV6 fatal error detection.

IPV6_ADDR_GEN_MODE=stable-privacy IPV6 address generation model

Physical device name of NAME=ens33 Nic

UUID=6e89ea13-f919-4096-ad67-cfc24a79a7e7 UUID identification code

DEVICE=ens33 network card device name

ONBOOT=yes self-boot (yes | no)

IPV6_PRIVACY=no

IPADDR=192.168.1.100 IP address

PREFIX=24 mask

Change BOOTPROTO=none to BOOTPROTO=dhcp here

Delete IPADDR=192.168.1.100 and PREFIX=24

Then save the file.

If you want the Nic configuration to take effect, you need to restart the network service and execute systemctl restart network.

Note: if an error occurs, the network service fails to restart. There may be a conflict with the NetworkManager service. Systemctl stop NetwrokManager stops the network management service before performing systemctl restart network.

Both of the above two methods can configure the network card as dhcp. Let's test whether it can be connected with ping.

Dhcp configured successfully

The above is all the contents of the article "how to use dhcp to get IP automatically under Linux". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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