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RTWN(4)			 BSD Kernel Interfaces Manual		       RTWN(4)

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 Real-
     tek 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 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 in-
		    ternal receive filter and enables the card to capture
		    packets from networks which	it wouldn't normally have ac-
		    cess 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 en-
     cryption 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.

BSD			       October 28, 2015				   BSD

NAME | SYNOPSIS | DESCRIPTION | FILES | EXAMPLES | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS | CAVEATS

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