OTUS(4) BSD Kernel Interfaces Manual OTUS(4)
otus -- Atheros USB IEEE 802.11a/b/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 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
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 current
encryption standard for wireless networks. It is strongly recommended
that WEP not be used as the sole mechanism to secure wireless communica-
tion, 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 can be installed using
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 example scans for available networks:
# ifconfig otus0 scan
The following hostname.if(5) example configures otus0 to join network
``mynwid'', using WPA key ``mywpakey'', obtaining an IP address using
otus0: error N, could not read firmware ... For some reason, the driver
was unable to read the microcode file from the filesystem. The file
might be missing or corrupted.
otus0: device timeout A frame dispatched to the hardware for transmis-
sion 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.
BSD April 26, 2017 BSD