---
name: "if_ure"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/if_ure"
---

# if\_ure(4)

Realtek RTL8152/RTL8153/RTL8156 USB Ethernet driver

## NAME

**ure** – Realtek RTL8152/RTL8153/RTL8156 USB Ethernet driver

## SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file:

**device uhci** **device ohci** **device usb** **device miibus** **device uether** **device ure**

Alternatively, to load the driver as a module at boot time, place the following line in [loader.conf(5)](/loader.conf/5.md):

```
if_ure_load="YES"
```

## DESCRIPTION

The **ure** driver supports the Realtek USB Ethernet Controller family.

The **ure** driver supports the following media types:

- **autoselect**

  Enable auto selection of the media type and options. The user can manually override the auto selected mode by adding media options to the */etc/rc.conf* file.

- **10baseT/UTP**

  Set 10Mbps operation. The **mediaopt** option can also be used to select either **full-duplex** or **half-duplex** modes.

- **100baseTX**

  Set 100Mbps (Fast Ethernet) operation. The **mediaopt** option can also be used to select either **full-duplex** or **half-duplex** modes.

- **1000baseTX**

  Set 1000baseTX (Gigabit Ethernet) operation over twisted pair. The Realtek gigE chips support 1000Mbps in **full-duplex** mode only.

- **2500base-T**

  Set 2500Base-T operation over twisted pair. The Realtek 8156/8156B chips support 2500Mbps in **full-duplex** mode only.

The **ure** driver supports the following media options for 10/100 operation:

- **full-duplex**

  Force full-duplex operation.

- **half-duplex**

  Force half-duplex operation.

For more information on configuring this device, see [ifconfig(8)](/ifconfig/8.md).

## HARDWARE

The **ure** driver supports the following USB Ethernet controllers:

| | |
| --- | --- |
| Model: | Speed (Mbps): |
| Realtek RTL8156/RTL8156B/RTL8156BG | 10, 100, 1000, and 2500 |
| Realtek RTL8153/RTL8153B | 10, 100, and 1000 |
| Realtek RTL8152 | 10 and 100 |
| Realtek RTL8168/8169/8110/8211 via [rgephy(4)](/rgephy/4.md) | 10, 100, and 1000 |

## DIAGNOSTICS

- ure%d: watchdog timeout

  A packet was queued for transmission and a transmit command was issued, however the device failed to acknowledge the transmission before a timeout expired.

## SEE ALSO

[arp(4)](/arp/4.md), [miibus(4)](/miibus/4.md), [netintro(4)](/netintro/4.md), [ng\_ether(4)](/ng_ether/4.md), [ifconfig(8)](/ifconfig/8.md)

## AUTHORS

The **ure** driver was written by Kevin Lo ⟨*kevlo@FreeBSD.org*⟩.