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URTW(4)			  OpenBSD Programmer's Manual		       URTW(4)

NAME
     urtw - Realtek RTL8187L/RTL8187B USB IEEE 802.11b/g wireless network
     device

SYNOPSIS
     urtw* at uhub? port ?

DESCRIPTION
     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
		    associating 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 de facto
     encryption standard for wireless networks.	 It is strongly recommended
     that WEP not be used as the sole mechanism to secure wireless
     communication, 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
     with hostname.if(5).

HARDWARE
     The following adapters should work:

	   Alfa AWUS036H
	   ASUS P5B Deluxe
	   Belkin F5D7050E
	   Linksys WUSB54GC v2
	   Netgear WG111v2
	   Netgear WG111v3
	   Shuttle XPC Accessory PN20
	   Sitecom WL-168 v1
	   Sitecom WL-168 v4
	   Surecom EP-9001-g rev 2A
	   TRENDnet TEW-424UB V3.xR

EXAMPLES
     The following hostname.if(5) example configures urtw0 to join whatever
     network is available on boot, using WEP key ``0x1deadbeef1'', channel 11,
     obtaining an IP address using DHCP:

	   dhcp NONE NONE NONE nwkey 0x1deadbeef1 chan 11

     Configure urtw0 to join network ``my_net'' using WPA with passphrase
     ``my_passphrase'':

	   # ifconfig urtw0 nwid my_net wpakey my_passphrase

     Join an existing BSS network, ``my_net'':

	   # ifconfig urtw0 192.168.1.1 netmask 0xffffff00 nwid my_net

SEE ALSO
     arp(4), ifmedia(4), intro(4), netintro(4), usb(4), hostname.if(5),
     hostapd(8), ifconfig(8)

     Realtek Semiconductor: http://www.realtek.com.tw/

HISTORY
     The urtw device driver first appeared in OpenBSD 4.5.

AUTHORS
     The urtw driver was written by Weongyo Jeong <weongyo@FreeBSD.org>.

OpenBSD 4.9		       November 1, 2010			   OpenBSD 4.9

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