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Title: Understanding Persistent Network Device Naming with UDEV on Linux

Introduction

In Linux systems, UDEV (Ubiquitous Event Demonstrator) is a device manager that handles events related to device addition, removal, and modification. One of the functionalities of UDEV is the persistent naming of network devices, which ensures that the same network interface is always assigned the same name, regardless of the order of device detection or reboots. This article will explain how persistent network device naming works on a Linux system, using the example of a OnePlus 5 device.

Persistent Network Device Naming with UDEV

UDEV uses rules to manage devices and their properties. These rules are stored in the /etc/udev/rules.d/ directory. The rules file responsible for persistent network device naming is 99-persistent-net.rules.

Example: OnePlus 5

Let's take the example of a OnePlus 5 device. The following rule in 99-persistent-net.rules assigns the name "hp" to the network interface with a serial number "d221c91d":

SUBSYSTEM=="net", ACTION=="add", ATTRS{serial}=="d221c91d", NAME="hp"

In this rule:

• SUBSYSTEM=="net" matches any network device.
• ACTION=="add" matches the event of a device being added.
• ATTRS{serial}=="d221c91d" matches the network device with a serial number "d221c91d".
• NAME="hp" assigns the name "hp" to the matched network device.

Samsung S24 (for comparison)

For comparison, let's consider a Samsung S24 device with a different serial number:

SUBSYSTEM=="net", ACTION=="add", ATTRS{serial}=="<different_serial_number>", NAME="<different_device_name>"

In this rule, replace <different_serial_number> with the actual serial number of the Samsung S24 device and <different_device_name> with the desired name for the device.

Code Block Formatting

In the code blocks above, the code is enclosed within <code> tags. The code inside the code blocks is properly formatted according to the programming language, including indentation and tabulation as needed.

References

• UDEV Homepage
• Persistent Network Device Naming
• UDEV Rules

Conclusion

Persistent network device naming with UDEV is a powerful feature that ensures network interfaces are consistently named across reboots. By creating and modifying rules in the 99-persistent-net.rules file, you can control the naming of your network devices in a Linux system.