What is the use of the net directory in linux

The "/sys/class/net" directory in Linux is a virtual file system directory used to manage and provide network interface information. Its functions are: 1. By accessing the net directory, you can view and modify it Relevant configuration information of each network interface in the system; 2. Provides real-time network interface status information, and can obtain statistical data about network interfaces; 3. The net directory allows management operations on network interfaces; 4. The information of virtual interfaces will Displayed in the directory, you can perform the same configuration and management operations on it as on the physical interface.

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

In Linux, the /sys/class/net directory is a virtual file system directory used to manage and provide network interface information. The subdirectories under this directory correspond to the network interfaces available in the system. The functions of the

/sys/class/net directory are as follows:

• Network interface configuration: By accessing the /sys/class/net directory, you can view and modify the system Related configuration information of each network interface, such as IP address, MAC address, subnet mask, MTU (Maximum Transmission Unit), etc.

• Network status monitoring: This directory provides real-time network interface status information. You can get statistics about a network interface, such as number of bytes received and sent, error count, packet loss count, etc. by reading the interface's file or directory.

• Network interface management: The /sys/class/net directory allows you to manage network interfaces, such as enabling or disabling interfaces, changing the name of the interface, adding or deleting virtual interfaces, etc.

• Virtual interface management: If virtual interfaces (such as VLAN interfaces, bridge interfaces, etc.) are used in the system, then the information of these virtual interfaces will be displayed in the /sys/class/net directory , you can perform the same configuration and management operations on it as on a physical interface.

Note that the subdirectory name in the /sys/class/net directory is the name of the network interface, such as eth0, wlan0, etc. Each subdirectory also contains other information and configuration files about the interface, such as address (MAC address), mtu (MTU settings), carrier (link status), etc.

In short, the /sys/class/net directory provides management, configuration and monitoring functions for network interfaces in Linux systems, allowing you to more conveniently operate and manage network interfaces in the system.

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