Fix Proxmox Network Device Becoming Inactive

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The Issue

The issue I was facing was my USB Ethernet adapter becoming inactive after a short amount of time. This resulted in LXC containers becoming unreachable on my local network.

The Situation

A little over a year ago, I started using Proxmox. Recently, I upgraded the internet plan at my provider, Odido, previously T-Mobile, (in The Netherlands) from 1 Gbit/s to 2 Gbit/s. And to make sure my home server had the network capacity to handle the 2 Gbit/s speed, I bought a USB Ethernet adapter.

‎Cable Matters ‎202095-E

The Ethernet adapter I bought was the ‎Cable Matters ‎202095-E. This adapter is capable of handling speeds up to 2,5Gbps and has a USB-C connector, including an adapter to USB-A. The chip providing this network power is the Realtek RTL8156B.


As my home server, I use the TRIGKEY HISTTON Green G4. This is an Intel N100 based Mini PC. I left the amount of RAM at 16 GB, but replaced the NVMe SSD with a KINGSTON SKC3000S1024G.

Home Assistant + several LXC containers

In Proxmox 8.1.4 I’m running a Home Assistant VM for my home automation and several LXC containers running a range of applications like N8N, Plex, Sabnzbd and more.

The Solution

To solve the issue of my USB Ethernet adapter becoming inactive was to disable auto-suspension for my ‎Cable Matters ‎202095-E. Let me tell you how to do this.

Find the USB Ethernet adapter ID

  • Log into Proxmox
  • In your node open Shell
  • Enter the following command
  • A list of USB devices will come up. Find the USB device that looks like this
Bus 002 Device 053: ID 0bda:8156 Realtek Semiconductor Corp. USB 10/100/1G/2.5G LAN
  • Note down the ID of the device. In my case, ‘0bda:8156’. You will need this later.
    • 0bda = idVendor
    • 8156 = idProduct

Make a persistent Udev rule to disable USB auto-suspension

  • In the shell enter the following command
sudo nano /etc/udev/rules.d/90-usb-power-management.rules
  • Now the nano-editor has been opened for the new 90-usb-power-management.rules file, add this rule in the editor
ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0bda", ATTR{idProduct}=="8156", ATTR{power/control}="on"
  • Be aware, replace the idVendor and idProduct code with the codes that can be found in the ID you noted down earlier.
  • After adding the rule you need to save the file. Hit CTRL + X and CTRL + Y
  • The new persistent Udev rule has been saved.

Reload Udev rules

  • In the shell enter the following command
sudo udevadm control --reload-rules && sudo udevadm trigger
  • After you ran the command, all Udev rules have been reloaded and triggered. The new rule we’ve added will take effect immediately.