What is the linux device interface index?

Linux device interface index refers to the unique identifier assigned to network interfaces, Ethernet cards, wifi interfaces and other devices under the Linux system. It can more conveniently manage and configure network interfaces, so that different processes or services can Use the correct network interface.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

Linux device interface index refers to the unique identifier assigned to network interfaces, Ethernet cards, wifi interfaces and other devices under the Linux system.

1. Function

The function of the Linux device interface index is to make it easier for us to manage and configure network interfaces, so that different processes or services can use the correct network interface. When we add, delete or modify a network interface, the Linux device interface index will dynamically change to ensure the uniqueness of the device.

2. How to use

You can use the `ifconfig` or `ip` command to view the information of all network interfaces on the current system, including device name, MAC address, IPv4 address, IPv6 address and status wait. These tools can also be used to configure, turn on or turn off network interfaces.

The following are some commonly used `ifconfig` and `ip` commands:

Use the ifconfig command to display all network interface information:

$ ifconfig -a

Use the ifconfig command to enable or disable specific Network interface:

# 启用eth0接口
$ sudo ifconfig eth0 up
# 禁用eth0接口
$ sudo ifconfig eth0 down

Use the ip command to set the IP address and mask:

# 设置ip地址192.168.1.2和掩码255.255.255.0到eth0接口上
$ sudo ip addr add 192.168.1.2/24 dev eth0
# 删除ip地址和掩码
$ sudo ip addr del 192.168.1.2/24 dev eth0

Use the ip command to display the network interface information:

$ ip link show

The above is the detailed content of What is the linux device interface index?. For more information, please follow other related articles on the PHP Chinese website!