OTUS(4) OpenBSD Programmer's Manual OTUS(4)
otus - Atheros USB IEEE 802.11a/g/n wireless network device
otus* at uhub? port ?
The otus driver supports USB 2.0 wireless network devices based on
Atheros Communications AR9001U chipset.
The AR9001U chipset is made of an AR9170 MAC/Baseband and an AR9101
(1T2R), AR9102 (2T2R) or AR9104 (dual-band 2T2R) Radio.
These are the modes the otus 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 otus 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 otus driver can be configured at runtime with ifconfig(8) or on boot
The driver needs at least version 1.0 of the following firmware files,
which are loaded when an interface is attached:
Although these firmware files are freely redistributable, their usage is
restricted. A prepackaged version of the firmware, designed to be used
with pkg_add(1), can be found at:
The following adapters should work:
CACE AirPcap Nx
D-Link DWA-130 rev D1
D-Link DWA-160 rev A1
D-Link DWA-160 rev A2
NEC Aterm WL300NU-G
Netgear WN111 v2
SMC Networks SMCWUSB-N2
Ubiquiti SR71 USB
The following hostname.if(5) example configures otus0 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 otus0 to join network ``my_net'' using WPA with passphrase
# ifconfig otus0 nwid my_net wpakey my_passphrase
Join an existing BSS network, ``my_net'':
# ifconfig otus0 192.168.1.1 netmask 0xffffff00 nwid my_net
otus%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.
otus%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.
arp(4), ifmedia(4), intro(4), netintro(4), usb(4), hostname.if(5),
The otus driver first appeared in OpenBSD 4.6.
The otus driver was written by Damien Bergamini <firstname.lastname@example.org>
based on source code licensed under the ISC released in 2008 by Atheros
Communications for Linux.
The AVM FRITZ!WLAN USB Stick N adapter is currently not supported.
The otus driver does not support any of the 802.11n capabilities offered
by the AR9001U chipset. Additional work is required in ieee80211(9)
before those features can be supported.
OpenBSD 5.1 June 9, 2011 OpenBSD 5.1
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