NAME

       rtwn — Realtek RTL8188CE PCIe IEEE 802.11b/g/n wireless network device

SYNOPSIS

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

             device rtwn
             device rtwnfw
             device wlan
             device firmware

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

             if_rtwn_load="YES"

       After  you  have  read  the  license  in  /usr/share/doc/legal/realtek.LICENSE  you  will want to add the
       following lines to loader.conf(5):

             legal.realtek.license_ack=1
             rtwn-rtl8192cfwU_load="YES"
             rtwn-rtl8192cfwU_B_load="YES"

DESCRIPTION

       The rtwn driver supports PCIe wireless network devices based on the Realtek RTL8188CE chipset.

       The RTL8188CE is a highly integrated 802.11n adapter that combines a MAC, a 1T1R capable baseband and  an
       RF in a single chip.  It operates in the 2GHz spectrum only.

       These are the modes the rtwn 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 rtwn 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 communication, due  to  serious
       weaknesses in it.

       The rtwn driver can be configured at runtime with ifconfig(8).

FILES

       The driver needs at least version 1.0 of the following firmware files, which are loaded when an interface
       is brought up:

             /boot/kernel/rtwn-rtl8192cfwU.ko
             /boot/kernel/rtwn-rtl8192cfwU_B.ko

EXAMPLES

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

             ifconfig wlan create wlandev rtwn0 inet 192.168.0.20 \
                 netmask 0xffffff00

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

             ifconfig wlan create wlandev rtwn0 ssid my_net up

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

             ifconfig wlan create wlandev rtwn0 ssid my_net \
                     wepmode on wepkey 0x1234567890 weptxkey 1 up

DIAGNOSTICS

       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.

       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

       pci(4), rtwnfw(4), wlan(4), wlan_ccmp(4), wlan_tkip(4), wlan_wep(4), ifconfig(8), wpa_supplicant(8)

HISTORY

       The rtwn driver first appeared in OpenBSD 5.8.

AUTHORS

       The  rtwn  driver  was  written  by  Stefan  Sperling  <stsp@openbsd.org>  and   ported   by   Kevin   Lo
       <kevlo@freebsd.org>.    It   was   based   on   the   urtwn(4)   driver   written   by  Damien  Bergamini
       <damien.bergamini@free.fr>.

CAVEATS

       The rtwn driver does not support any of the 802.11n capabilities offered  by  the  adapters.   Additional
       work is required in ieee80211(9) before those features can be supported.

Debian                                          October 28, 2015                                         RTWN(4)