Renaming Identical Huawei E3372-325 Modems on Debian 12

Introduction

In today's world, having multiple identical devices connected to a computer is a common scenario. One such example is having two Huawei E3372-325 modems connected to a Debian 12 system. By default, these modems are identified by their MAC addresses. However, it is essential to assign them human-readable, persistent names for easier management.

Prerequisites

Before we begin, ensure the following:

• Two identical Huawei E3372-325 modems are connected to your Debian 12 system.
• Both modems are configured and working correctly.

Renaming the Modems

To assign persistent names to the modems, we will use the /etc/udev/rules.d directory. This directory contains rules that allow us to define custom names for devices based on specific criteria.

Step 1: Identify the Device Names

First, we need to identify the names of the modems as assigned by the system. Run the following command:

$ ls /dev/cdc*

This command will list all the available modem devices. Identify the names of the two Huawei E3372-325 modems.

Step 2: Create the Rules File

Create a new file in the /etc/udev/rules.d directory with a name that includes the modem's persistent name. For example, create a file named 51-huawei-modem.rules. Open the file using your favorite text editor:

$ sudo nano /etc/udev/rules.d/51-huawei-modem.rules

Step 3: Define the Rules

Add the following lines to the file, replacing DEVNAME with the actual device names identified in step 1:

ACTION=="add", SUBSYSTEM=="tty", ATTR{idVendor}=="12d1", ATTR{idProduct}=="1446", KERNEL=="ttyUSB*", SYMLINK+="huawei_modem%k"
 ACTION=="add", SUBSYSTEM=="tty", ATTR{idVendor}=="12d1", ATTR{idProduct}=="1447", KERNEL=="ttyUSB*", SYMLINK+="huawei_modem1%k"

Save and exit the file.

Step 4: Reload the Udev Rules

To apply the new rules, reload the udev rules:

$ sudo udevadm control --reload-rules

Verification

To verify that the modems have been renamed, run the following command:

$ ls /dev/huawei_modem*