NAME

       urtwn — Realtek RTL8188CU/RTL8188RU/RTL8188EU/RTL8192CU USB IEEE 802.11b/g/n wireless network device

SYNOPSIS

       options URTWN_WITHOUT_UCODE

       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 urtwn
             device wlan

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

             if_urtwn_load="YES"

DESCRIPTION

       The  urtwn  driver  supports USB 2.0 wireless network devices based on Realtek RTL8188CUS, RTL8188CE-VAU,
       RTL8188EUS, RTL8188RU and RTL8192CU chipsets.

       The RTL8188CUS and RTL8188EUS are highly integrated 802.11n adapters that combine a MAC, a  1T1R  capable
       baseband  and  an RF in a single chip.  They operate in the 2GHz spectrum only.  The RTL8188RU is a high-
       power variant of the RTL8188CUS.  The RTL8188CE-VAU is a PCI Express Mini Card adapter that  attaches  to
       the USB interface.

       The  RTL8192CU  is  a  highly integrated multiple-in, multiple-out (MIMO) 802.11n adapter that combines a
       MAC, a 2T2R capable baseband and an RF in a single chip.  It operates in the 2GHz spectrum only.

       All chips have hardware support for  WEP, AES-CCM and TKIP encryption.

       The driver supports station, adhoc, hostap, and monitor mode operation.  Only one virtual  interface  may
       be configured at any time.

       This  driver  may  use  the  firmware  built  with  the urtwnfw module for some additional features (when
       URTWN_WITHOUT_UCODE kernel option is not set).

FILES

       /usr/share/doc/legal/realtek.LICENSE  urtwn firmware license

HARDWARE

       The urtwn driver supports Realtek  RTL8188CU/RTL8188RU/RTL8188EU/RTL8192CU  based  USB  IEEE  802.11b/g/n
       wireless network adapters, including:

             Alfa AWUS036NHR v2
             ASUS USB-N10 NANO
             Belkin F7D1102 Surf Wireless Micro
             D-Link DWA-123 rev
             D-Link DWA-125 rev
             D-Link DWA-131
             Edimax EW-7811Un
             Elecom WDC-150SU2M
             Netgear WNA1000M
             Realtek RTL8192CU
             Realtek RTL8188CUS
             TP-LINK TL-WN723N v3
             TP-LINK TL-WN725N v2

EXAMPLES

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

             ifconfig wlan create wlandev urtwn0 inet 192.168.0.20 \
                 netmask 0xffffff00

       Join a specific BSS network with network name “my_net”:

             ifconfig wlan create wlandev urtwn0 ssid my_net up

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

             ifconfig wlan create wlandev urtwn0 ssid my_net \
                     wepmode on wepkey 0x1234567890 weptxkey 1 up

       Create an IBSS network with 128-bit WEP encryption on the channel 4:

             ifconfig wlan0 create wlandev urtwn0 wlanmode adhoc ssid my_net \
                     wepmode on wepkey 0x01020304050607080910111213 weptxkey 1 \
                     channel 4

       Join/create an 802.11b IBSS network with network name “my_net”:

             ifconfig wlan0 create wlandev urtwn0 wlanmode adhoc
             ifconfig wlan0 inet 192.168.0.22 netmask 0xffffff00 ssid my_net \
                     mode 11b

       Create an 802.11g host-based access point:

             ifconfig wlan0 create wlandev urtwn0 wlanmode hostap
             ifconfig wlan0 inet 192.168.0.10 netmask 0xffffff00 ssid my_ap \
                     mode 11g

DIAGNOSTICS

       urtwn%d:  error  %d,  could  not  read  firmware  %s   For some reason, the driver was unable to read the
       microcode file from the filesystem.  The file might be missing or corrupted.

       urtwn%d: device timeout  A frame dispatched to the hardware for transmission did not  complete  in  time.
       The driver will reset the hardware.  This should not happen.

SEE ALSO

       intro(4),   netintro(4),   urtwnfw(4),   usb(4),   wlan(4),   wlan_amrr(4),  wlan_ccmp(4),  wlan_tkip(4),
       wlan_wep(4), ifconfig(8), wpa_supplicant(8)

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

HISTORY

       The urtwn driver first appeared in OpenBSD 4.9 and FreeBSD 10.0.

AUTHORS

       The urtwn driver was written by Damien Bergamini <damien@openbsd.org>.

CAVEATS

       The urtwn driver currently does not support A-MPDU 802.11n transmit aggregation.

       For non-RTL8188EUS chips “rate control” algorithm is absent; this may result in increased packet loss  in
       noisy networks.

Debian                                            June 9, 2016                                          URTWN(4)