What is the command to configure ip address in linux?

Linux configuration ip address command: 1. Ifconfig command, you can configure the ip address of the network card, the syntax is "Ifconfig ethx ipaddr netmask x.x.x.x"; this command is usually used for zero-time testing. After the computer starts, the ip address The configuration will automatically become invalid. 2. neat command. 3. netconfig command. 4. "vi /etc/sysconfig/network-scripts/ifcfg-ethx" command.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

Four ways to configure the IP address under Linux

After the Linux system is installed, configure the network card IP through the command mode.

The configuration file is usually the content displayed after /etc/sysconfig/network-scripts/ifcfg-interface-name

ifconfig, lo represents loop.

1. Ifconfig command

x in ethx represents the fastest Ethernet card, the default first block is 0; ipaddr represents the ip address; x.x.x.x is the subnet mask.

For example, the IP address configured for the network card eth0 is 192.168.1.1 and the subnet mask is 255.255.255.0.

As shown below:

2. Neat command

Neat command=redhat-config-network Configure the ip address under the graphic:

Double-click the red line under the picture

After double-clicking the underlined part, the following picture will appear: Configure relevant information as required

3. netconfig command

After entering netconfig, the following figure will appear. Click the yes button.

Note: The ip address configured by this method will still be valid after the computer is restarted.

4.vi /etc/sysconfig/network-scripts/ifcfg-ethx

##Restart after configuration Service, i

p address is configured. In fact, the previous 3 configuration methods ultimately changed the configuration file under /etc/sysconfig/network-scripts/ifcfg-ethx.

How to configure Linux fixed ip and temporary ip?

Modify the ifcfg-eth0 file and set the ONBOOT value to yes to use the network card when the network service starts.

Set the value of BOOTPROTO to dhcp to allow the network card to automatically obtain an IP address from the DHCP server.

Use the command to modify vi /etc/sysconfig/network-scripts/ifcfg-eth0 ONBOOT=yes BOOTPROTO=dhcp to temporarily configure ip ifconfig eth0 network 255.255.255.0 (subnet mask set by yourself)

This command is to set the subnet mask of the host, and the setting is also temporary.

How to configure the network IP address of the Linux system?

First log in to the system as the root user, and then use the lspci | grep Ethernet command to check whether the Ethernet card device on the computer is detected by the kernel. Here I would like to remind everyone that by default, only root, that is, the root user, has permission to configure the network. The red box contains the detected network card information.

#Then use the "ifconfig" command to view the network interfaces that have been recognized and activated by the system. If not found, you can use the "ifconfig -a" command to find all identified network interfaces including inactive ones, and then use "ifconfig network card name up" to activate them. It can be seen that there is an activated eth0 network card on my CentOS6.4 system. Next, I will set up this network card to make it work.

Here I will first show you how to temporarily specify an IP address. Entering "ifconfig network card name IP address netmask subnet mask" on the command line can temporarily specify the IP address of the network card, but it will become invalid after restarting. Compared to the previous picture, my temporary IP settings have taken effect.

Next, I will show you how to permanently change the IP address.

The first step is to use "vi /etc/sysconfig/network-scripts/ifcfg-eth0" to edit the configuration file of the network card eth0. What should be noted here is that if dhcp is set to automatically obtain an IP address, then IPADDR, NETMASK and GATWAY do not need to be written.

The second step is to use the "service network restart" command to restart the network service to make the configuration file take effect. All four states must be OK, otherwise it means there is a problem with the settings and the settings need to be modified again.

Finally, use the "ifconfig" command again to view the network card parameters. It can be seen that the IP address has been modified successfully and will be retained.

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