Do you have a USB3 2.5Gbe network adapter that doesn’t work well in Linux? Well, the kernel has included the upgraded Realtek drivers for awhile now, but for some reason it needs additional udev rules to load correctly. It’s a pretty simple fix and results in dramatically improved bandwidth (full duplex ~1.5Gbps and half duplex ~1.9Gbps), and functions properly with the correct driver.

tl;dr if you’re on a Debian-based system (including Proxmox) create the udev file below and reboot, and it should work fine. Validate it by running dmesg | grep enx to see if it bound the right driver for your enxXXXXXXXXXXXX interface.

Video⌗

Udev File⌗

This file needs to go at /etc/udev/rules.d/50-usb-realtek-net.rules

And the file contents (from the Realtek driver download):

# This is used to change the default configuration of Realtek USB ethernet adapters

ACTION!="add", GOTO="usb_realtek_net_end"
SUBSYSTEM!="usb", GOTO="usb_realtek_net_end"
ENV{DEVTYPE}!="usb_device", GOTO="usb_realtek_net_end"

# Modify this to change the default value
ENV{REALTEK_MODE1}="1"
ENV{REALTEK_MODE2}="3"

# Realtek
ATTR{idVendor}=="0bda", ATTR{idProduct}=="815[2,3,5,6]", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="0bda", ATTR{idProduct}=="8053", ATTR{bcdDevice}=="e???", ATTR{bConfigurationValue}!="$env{REALTEK_MODE2}", ATTR{bConfigurationValue}="$env{REALTEK_MODE2}"

# Samsung
ATTR{idVendor}=="04e8", ATTR{idProduct}=="a101", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"

# Lenovo
ATTR{idVendor}=="17ef", ATTR{idProduct}=="304f", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="3052", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="3054", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="3057", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="3062", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="3069", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="3082", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="3098", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="7205", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="720a", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="720b", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="720c", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="7214", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="721e", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="8153", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="a359", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"
ATTR{idVendor}=="17ef", ATTR{idProduct}=="a387", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"

# TP-LINK
ATTR{idVendor}=="2357", ATTR{idProduct}=="0601", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"

# Nvidia
ATTR{idVendor}=="0955", ATTR{idProduct}=="09ff", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"

# LINKSYS
ATTR{idVendor}=="13b1", ATTR{idProduct}=="0041", ATTR{bConfigurationValue}!="$env{REALTEK_MODE1}", ATTR{bConfigurationValue}="$env{REALTEK_MODE1}"

LABEL="usb_realtek_net_end"

FIXING my USB3 2.5Gbe network adapters on Linux / Proxmox!

Video⌗

Udev File⌗