---
name: "if_urtw"
section: "4freebsd"
platform: "linux"
package: "freebsd-manpages"
version: "12.2-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/if_urtw/4freebsd"
---

# if\_urtw(4freebsd)

Realtek RTL8187B/L USB IEEE 802.11b/g wireless network device

## NAME

**urtw** – Realtek RTL8187B/L USB IEEE 802.11b/g wireless network device

## SYNOPSIS

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

**device ehci** **device uhci** **device ohci** **device usb** **device urtw** **device wlan**

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

```
if_urtw_load="YES"
```

## DESCRIPTION

The **urtw** driver supports USB 802.11b/g wireless adapters based on the Realtek RTL8187B/L.

**urtw** supports **station** and **monitor** mode operation. Only one virtual interface may be configured at any time. For more information on configuring this device, see [ifconfig(8)](/ifconfig/8.md).

## HARDWARE

The **urtw** driver supports Realtek RTL8187B/L based wireless network devices, including:

| | | |
| --- | --- | --- |
| *Card* | Radio | Bus |
| Belkin F5D7050E | RTL8225 | USB |
| Linksys WUSB54GCv2 | RTL8225 | USB |
| Netgear WG111v2 | RTL8225 | USB |
| Netgear WG111v3 | RTL8225 | USB |
| Safehome WLG-1500SMA5 | RTL8225 | USB |
| Shuttle XPC Accessory PN20 | RTL8225 | USB |
| Sitecom WL168v1 | RTL8225 | USB |
| Sitecom WL168v4 | RTL8225 | USB |
| SureCom EP-9001-g(2A) | RTL8225 | USB |
| TRENDnet TEW-424UB V3.xR | RTL8225 | USB |

## EXAMPLES

Join an existing BSS network (i.e., connect to an access point):

```
ifconfig wlan create wlandev urtw0 inet 192.168.0.20 \
    netmask 0xffffff00
```

Join a specific BSS network with network name “my\_net”:

```
ifconfig wlan create wlandev urtw0 ssid my_net up
```

Join a specific BSS network with 64-bit WEP encryption:

```
ifconfig wlan create wlandev urtw0 ssid my_net \
	wepmode on wepkey 0x1234567890 weptxkey 1 up
```

## SEE ALSO

[intro(4)](/intro/4.md), [netintro(4)](/netintro/4.md), [usb(4)](/usb/4.md), [wlan(4)](/wlan/4.md), [wlan\_ccmp(4)](/wlan_ccmp/4.md), [wlan\_tkip(4)](/wlan_tkip/4.md), [wlan\_wep(4)](/wlan_wep/4.md), [ifconfig(8)](/ifconfig/8.md), [wpa\_supplicant(8)](/wpa_supplicant/8.md) *Realtek*, http://www.realtek.com.tw.

## HISTORY

The **urtw** device driver first appeared in FreeBSD 8.0.

## AUTHORS

The **urtw** driver was written by Weongyo Jeong ⟨*weongyo@FreeBSD.org*⟩.