URTW(4) BSD Kernel Interfaces Manual URTW(4)
urtw -- Realtek RTL8187L/RTL8187B USB IEEE 802.11b/g wireless network
urtw* at uhub? port ?
The urtw driver supports USB 802.11b/g wireless adapters based on the
Realtek RTL8187L and RTL8187B.
These are the modes the urtw driver can operate in:
BSS mode Also known as infrastructure mode, this is used when asso-
ciating with an access point, through which all traffic
passes. This mode is the default.
monitor mode In this mode the driver is able to receive packets without
associating with an access point. This disables the
internal receive filter and enables the card to capture
packets from networks which it wouldn't normally have
access to, or to scan for access points.
The urtw driver can be configured to use Wired Equivalent Privacy (WEP)
or Wi-Fi Protected Access (WPA-PSK and WPA2-PSK). WPA is the current
encryption standard for wireless networks. It is strongly recommended
that WEP not be used as the sole mechanism to secure wireless communica-
tion, due to serious weaknesses in it. The urtw driver relies on the
software 802.11 stack for both encryption and decryption of data frames.
The urtw driver can be configured at runtime with ifconfig(8) or on boot
The following adapters should work:
ASUS P5B Deluxe
Linksys WUSB54GC v2
Shuttle XPC Accessory PN20
Sitecom WL-168 v1
Sitecom WL-168 v4
Surecom EP-9001-g rev 2A
TRENDnet TEW-424UB V3.xR
The following example scans for available networks:
# ifconfig urtw0 scan
The following hostname.if(5) example configures urtw0 to join network
``mynwid'', using WPA key ``mywpakey'', obtaining an IP address using
arp(4), ifmedia(4), intro(4), netintro(4), usb(4), hostname.if(5),
The urtw device driver first appeared in OpenBSD 4.5.
The urtw driver was written by Weongyo Jeong <weongyo@FreeBSD.org>.
BSD March 28, 2017 BSD