atu —
Atmel AT76C50x USB IEEE 802.11b wireless network device
The
atu driver provides support for wireless network
adapters based around the Atmel AT76C503, AT76C503A, AT76C505, and AT76C505A
USB chipsets and four companion radio chipsets.
The atu driver encapsulates all IP and ARP
traffic as 802.11 frames, though it can receive either 802.11 or 802.3
frames.
These are the modes the atu 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.
- IBSS mode
- Also known as IEEE ad-hoc mode or
peer-to-peer mode. This is the standardized method of
operating without an access point. Stations associate with a service set.
However, actual connections between stations are peer-to-peer.
The atu driver can be configured to use
hardware Wired Equivalent Privacy (WEP). It is strongly recommended that WEP
not be used as the sole mechanism to secure wireless communication, due to
serious weaknesses in it.
The atu driver can be configured at
runtime with ifconfig(8) or on boot
with hostname.if(5).
The adapter needs some firmware files, which are loaded on demand by the driver
when the device is attached:
- /etc/firmware/atu-at76c503-i3863-int
-
- /etc/firmware/atu-at76c503-i3863-ext
-
- /etc/firmware/atu-at76c503-rfmd-acc-int
-
- /etc/firmware/atu-at76c503-rfmd-acc-ext
-
- /etc/firmware/atu-at76c505-rfmd-int
-
- /etc/firmware/atu-at76c505-rfmd-ext
-
- /etc/firmware/atu-intersil-int
-
- /etc/firmware/atu-intersil-ext
-
- /etc/firmware/atu-rfmd-int
-
- /etc/firmware/atu-rfmd-ext
-
- /etc/firmware/atu-rfmd2958-int
-
- /etc/firmware/atu-rfmd2958-ext
-
- /etc/firmware/atu-rfmd2958smc-int
-
- /etc/firmware/atu-rfmd2958smc-ext
-
The following devices are known to be supported by the
atu driver:
- 3Com 3CRSHEW696
-
- AboCom BWU613
-
- Accton 2664W
-
- Acer Peripherals AWL300
-
- Acer Peripherals AWL400
-
- Actiontec 802UAT1
-
- Addtron AWU120
-
- Aincomm AWU2000B
-
- Askey Computer Voyager 1010
-
- Askey Computer WLL013 (Intersil Radio)
-
- Askey Computer WLL013 (RFMD Radio)
-
- Atmel AT76C503 (Intersil Radio)
-
- Atmel AT76C503 (RFMD Radio)
-
- Atmel AT76C505 (RFMD Radio)
-
- Atmel AT76C505 (RFMD 2958 Radio)
-
- Atmel AT76C505A (RFMD 2958 Radio)
-
- Atmel AT76C505AS (RFMD 2958 Radio)
-
- Belkin F5D6050
-
- Bluetake BW002
-
- Compaq iPAQ h54xx/h55xx Internal WLAN
-
- Conceptronic C11U
-
- Conceptronic WL210
-
- Corega WLAN USB Stick 11
-
- Dick Smith Electronics CHUSB 611G
-
- Dick Smith Electronics WL200U
-
- Dick Smith Electronics WL240U
-
- Dick Smith Electronics XH1153
-
- D-Link DWL-120 rev E
-
- Geowave GW-US11S
-
- Gigabyte GN-WLBM101
-
- Gigaset WLAN
-
- Hewlett-Packard HN210W
-
- Intel AP310 AnyPoint II
-
- I/O DATA USB WN-B11
-
- Lexar 2662W-AR
-
- Linksys WUSB11 802.11b
-
- Linksys WUSB11 802.11b v2.8
-
- MSI WLAN
-
- Netgear MA101
-
- Netgear MA101 rev B
-
- OQO model 01 WiFi
-
- Ovislink AirLive WL-1120USB
-
- OvisLink AirLive WL-1130USB
-
- Planex Communications GW-US11S
-
- Samsung SWL2100W
-
- Siemens WLL013
-
- SMC EZ Connect 11Mbps (SMC2662w)
-
- SMC EZ Connect 11Mbps v2 (SMC2662wV2)
-
- Tekram U-300C
-
- TRENDnet TEW-229UB
-
- W-Buddie WN210
-
- Z-Com M4Y-750
-
The following example scans for available networks:
# ifconfig atu0 scan
The following
hostname.if(5) example configures
atu0 to join network “mynwid”, using WEP key
“mywepkey”, obtaining an IP address using DHCP:
nwid mynwid nwkey mywepkey
dhcp
The atu driver was written by Daan
Vreeken and ported to OpenBSD by
Theo de Raadt and David
Gwynne.
The atu driver does not support a lot of the
functionality available in the hardware. More work is required to properly
support the IBSS, power management, and selectable transmission rate features.
![[OpenBSD]](/openbsd.gif){kind=small}