SoFunction
Updated on 2025-04-13

Three ways to configure IP address in Linux

Environment Redhat9

The first installation directly configures network card files

1. Check the network card

You will find a file that will tell us where the network card file is. This is unique to the 9 version. The old version will appear directly in cd /etc/sysconfig/network-scripts.

  • cd /etc/sysconfig/network-scripts/Switch to network card configuration file directory
  • Enter ls and you will find a file. This file will tell us where the network card is. Enter this file and then find /etc/NetworkManager/system-connections/ and tab. This is our network card configuration file.

2. Enter the network card file for configuration

  • Enter vim /etc/NetworkManager/system-connections/  tab here
  • Here you only need to change the content of ipv4
  • Enter address1 = ip address/24 (subnet mask) +, gateway
dns=114.114.114.114;
method=manual

3 Restart the network card configuration

systemctl restart NetworkManager Restart
ip a Check it out

The second method nmcli (Networkmanager command-line interface (interface))

First check the current network connection status nmcli connection show

Configure network card

enter nmcli connection modify（Meaning of modification） ens160   enteripaddress/24(24It's the subnet mask)  enter网关  manual  114.114.114.114 autoconnect yes

Reload the network card and start it again

  • Reload this network card connection nmcli connection reload
  • Restart this network card again nmcli connection up ens33
  • Use ip a to view it found that the modification was successful

The third method nmtui is the same as the third method below

Environment centos7

The first method is to directly configure network card files

cd /etc/sysconfig/network-scripts Enter the network card configuration file
ls View network card files What we need to configure isens33
vi ifcfg-ens33 Make configuration  （Note that you enter on the correct path as follows
[root@localhost network-scripts]# vi ifcfg-ens33）

After entering, only these are saved

TYPE="Ethernet"        
BOOTPROTO=static  GetIPChange the address method to manualorStatic
NAME=ens33
DEVICE=ens33
ONBOOT=yes			//The network interface is opened and changed to yesIPADDR=192.168.10.11		//Define the specified IPPREFIX=24				//Define the specified subnet maskGATEWAY=192.168.10.2		//Define the specified gatewayDNS1=114.114.114.114		//Define the preferred dns serverDNS2=8.8.8.8				//Define alternativesdnsserver

Finally restart the service

service network restart

Then use ip a to view again

The second way to use nmcli

  • nmcli is a command line tool for NetworkManager to manage and configure network connections. It can be used to view the status of the current network connection, configure a new network connection, enable and disable network connections, and so on.
  • nmcli supports most common network connection types, such as Ethernet, Wi-Fi, VPN, etc. Through the nmcli command, users can easily manage network connections under the command line interface without relying on graphical interface tools

The nmcli command can be used in the following scenarios:

  • ‌Check the status of the current network connectionusenmcli connection showThe command can view the connected network card information‌3.
  • ‌Configure a new network connection‌: The nmcli command can create a new network connection, including Ethernet, Wi-Fi, VPN, etc. ‌3.
  • ‌Enable and disable network connections‌: Use the nmcli command to enable or disable a specific network connection‌3.
  • ‌Check the status of network card equipmentusenmcli device statusThe command can view the status 3 of all network interface devices.
  • ‌Delete network card deviceusenmcli device deleteCommands can delete specific network devices‌3.

Check the current network connection status first

nmcli connection show

Make configuration

nmcli connection modify ens33  192.168.10.11/24  192.168.10.2  114.114.114.114 autoconnect yes

Reload this network card connection

nmcli connection reload

Restart this network card again

nmcli connection up ens33

Verify to see if it is successful. You can use the modified IP address to connect to the terminal again or enter the local machine to view it.

The third way is to use nmtui network configuration manager

  • Enter nmtui to enter the network configuration manager
  • Click the first Edit a connection to enter the edit network card connection. Select ens33 and press enter key.
  • Enter ens33 to complete the configuration Change ip a gateway dns connection method Slide and click OK
  • Return to the initial page and click Activate a connection (meaning to enable connection) Click ens33 Press enter key and restart the virtual machine. The modification is successful.
  • Click Activate a connection (meaning to enable connection) Click ens33, press enter key and restart the virtual machine. The modification is successful.

Summarize

The above is personal experience. I hope you can give you a reference and I hope you can support me more.