ancontrol - configure Aironet 4500/4800 devices
ancontrol [interface] [-AChINQSTZ] [[-v 1|2|3|4] -a AP]
[-b beacon_period] [-c channel] [-v 0|1 -d
0|1|2|3]
[-e 0|1|2|3] [-f fragmentation_threshold] [-j
netjoin_timeout]
[-K 0|1|2] [-v 0|1|2|3|4|5|6|7 -k key] [-l
station_name]
[-m macaddress] [[-v 1|2|3] -n SSID] [-o 0|1] [-p
tx_power]
[-r RTS_threshold] [-s 0|1|2|3] [-t 0|1|2|3|4] [-W
0|1|2]
The ancontrol command controls the operation of Aironet
wireless networking
devices via the an(4) driver. Most of the parameters
that can be
changed relate to the IEEE 802.11 protocol which the Aironet
cards implement.
This includes the station name, whether the station
is operating
in ad-hoc (point to point) or infrastructure mode, and the
network name
of a service set to join. ancontrol can also be used to
view the current
NIC status, configuration, and to dump the values of the
card's statistics
counters.
The interface argument given to ancontrol should be the logical interface
name associated with the Aironet device (e.g., an0, an1,
etc...). If no
interface is specified, `an0' is used.
The options are as follows:
-A Display the preferred access point list. The AP
list can be used
by stations to specify the MAC address of access
points with
which it wishes to associate. If no AP list is
specified (the
default) then the station will associate with the
first access
point that it finds which serves the SSID(s) specified in the
SSID list. The AP list can be modified with the -a
option.
[-v 1|2|3|4] -a AP
Set preferred access point. The AP is specified as
a MAC address
consisting of 6 hexadecimal values separated by
colons. By default,
the -a option only sets the first entry in
the AP list.
The -v modifier can be used to specify exactly which
AP list entry
is to be modified. If the -v flag is not used,
the first AP
list entry will be changed.
-b beacon_period
Set the ad-hoc mode beacon period. The beacon period is specified
in milliseconds. The default is 100ms.
-C Display current NIC configuration. This shows the
current operation
mode, receive mode, MAC address, power save
settings, various
timing settings, channel selection, diversity,
transmit power,
and transmit speed.
-c channel
Set the radio frequency of a given interface. The
frequency
should be specified as a channel ID as shown in the
table below.
The list of available frequencies is dependent on
radio regulations
specified by regional authorities. Recognized
regulatory
authorities include the FCC (United States), ETSI
(Europe),
France, and Japan. Frequencies in the table are
specified in
MHz.
Channel ID FCC ETSI France Japan
1 2412 2412 - -
2 2417 2417 - -
3 2422 2422 - -
4 2427 2427 - -
5 2432 2432 - -
6 2437 2437 - -
7 2442 2442 - -
8 2447 2447 - -
9 2452 2452 - -
10 2457 2457 2457 -
11 2462 2462 2462 -
12 - 2467 2467 -
13 - 2472 2472 -
14 - - - 2484
If an illegal channel is specified, the NIC will revert to its
default channel. For NICs sold in the United States
and Europe,
the default channel is 3. For NICs sold in France,
the default
channel is 11. For NICs sold in Japan, the only
available channel
is 14. Note that two stations must be set to
the same channel
in order to communicate.
-v 0|1 -d 0|1|2|3
Select the antenna diversity. Aironet devices can
be configured
with up to two antennas, and transmit and receive
diversity can
be configured accordingly. Valid selections are as
follows:
Selection Diversity
0 Select factory default diversity
1 Antenna 1 only
2 Antenna 2 only
3 Antenna 1 and 2
The receive and transmit diversity can be set independently. The
user must specify which diversity setting is to be
modified by
using the -v option: selection 0 sets the receive
diversity and 1
sets the transmit diversity.
-e 0|1|2|3
Set the transmit WEP key to use. Note that until
this command is
issued, the device will use the last key programmed.
The transmit
key is stored in NVRAM. The currently set
transmit key can
be checked via -C option.
-f fragmentation_threshold
Set the fragmentation threshold in bytes. This
threshold controls
the point at which outgoing packets will be
split into multiple
fragments. If a single fragment is not sent
successfully,
only that fragment will need to be retransmitted instead of the
whole packet. The fragmentation threshold can be
anything from
64 to 2312 bytes. The default is 2312.
-h Prints a list of available options and sample usage.
-I Display NIC capability information. This shows the
device type,
frequency, speed, power level capabilities, and
firmware revision
levels.
-j netjoin_timeout
Set the ad-hoc network join timeout. When a station
is first activated
in ad-hoc mode, it will search out a ``master'' station
with the desired SSID and associate with it. If the
station is
unable to locate another station with the same SSID
after a suitable
timeout, it sets itself up as the master so
that other stations
may associate with it. This timeout defaults
to 10000 milliseconds
(10 seconds) but may be changed with this
option. The
timeout should be specified in milliseconds.
-K 0|1|2
Set authorization type. Use 0 for none, 1 for
"Open", 2 for
"Shared Key".
-v 0|1|2|3|4|5|6|7 -k key
Set a WEP key. For 40 bits, prefix 10 hex digits
with 0x. For
128 bits, prefix 26 hex digits with 0x. Use "" as
the key to
erase it. Supports 4 keys; even numbers are for
permanent keys
and odd numbers are for temporary keys. For example, "-v 1" sets
the first temporary key. (A "permanent" key is
stored in NVRAM;
a "temporary" key is not.) Note that the device
will use the
most recently-programmed key by default. Currently
set keys can
be checked via the -C option; only the sizes of the
keys are returned.
-l station_name
Set the station name used internally by the NIC.
station_name
can be any text string up to 16 characters in
length. The default
name is set by the driver to "OpenBSD".
-m macaddress
Set the station address for the specified interface.
The
macaddress is specified as a series of six hexadecimal values
separated by colons, e.g. 00:60:1d:12:34:56. This
programs the
new address into the card and updates the interface
as well.
-N Display the SSID list. This is a list of service
set IDs (i.e.,
network names) with which the station wishes to associate. There
may be up to three SSIDs in the list: the station
will go through
the list in ascending order and associate with the
first matching
SSID that it finds.
[-v 1|2|3] -n SSID
Set the desired SSID (network name). There are
three SSIDs which
allows the NIC to work with access points at several
locations
without needing to be reconfigured. The NIC checks
each SSID in
sequence when searching for a match. The SSID to be
changed can
be specified with the -v modifier option. If the -v
flag isn't
used, the first SSID in the list is set.
-o 0|1 Set the operating mode of the Aironet interface.
Valid selections
are 0 for ad-hoc mode and 1 for infrastructure
mode. The
default driver setting is for infrastructure mode.
-p tx_power
Set the transmit power level in milliwatts. Valid
power settings
vary depending on the actual NIC and can be viewed
by dumping the
device capabilities with the -I flag. Typical values are 1, 5,
20, 50, and 100mW. Selecting 0 sets the factory default.
-Q If driver was compiled with option ANCACHE (default)
then display
the signal cache contents. A maximum of 16 station
addresses are
collected on the list with LRU expiration policy.
Information
such as MAC address, IP address, and signal strength
is collected
from the most recent matching packet received.
-r RTS_threshold
Set the RTS/CTS threshold for a given interface.
This controls
the number of bytes used for the RTS/CTS handshake
boundary. The
RTS_threshold can be any value between 0 and 2312.
The default
is 2312.
-S Display NIC status information. This includes the
current operating
status, current BSSID, SSID, channel, beacon
period, and
currently associated access point. The operating
mode indicates
the state of the NIC, MAC status, and receiver status. When the
``synced'' keyword appears, it means the NIC has
successfully associated
with an access point, associated with an
ad-hoc
``master'' station, or become a ``master'' itself.
The beacon
period can be anything between 20 and 976 milliseconds. The default
is 100.
-s 0|1|2|3
Set power save mode. Valid selections are as follows:
Selection Power save mode
0 None - power save disabled
1 Constantly awake mode (CAM)
2 Power Save Polling (PSP)
3 Fast Power Save Polling (PSPCAM)
Note that for IBSS (ad-hoc) mode, only PSP mode is
supported, and
only if the ATIM window is non-zero.
-T Display the NIC's internal statistics counters.
-t 0|1|2|3|4
Select transmit speed. The available settings are
as follows:
TX rate NIC speed
0 Auto -- NIC selects optimal speed
1 1Mbps fixed
2 2Mbps fixed
3 5.5Mbps fixed
4 11Mbps fixed
Note that the 5.5 and 11Mbps settings are only supported on the
4800 series adapters: the 4500 series adapters have
a maximum
speed of 2Mbps.
-W 0|1|2
Enable WEP. Use 0 for no WEP, 1 to enable full WEP,
2 for mixed
cell.
-Z Purge the signal cache contents (see above).
WEP ("wired equivalent privacy") is based on the RC4 algorithm, using a
24-bit initialization vector.
RC4 is supposedly vulnerable to certain known plaintext attacks, especially
with 40-bit keys. So the security of WEP in part depends on how
much known plaintext is transmitted.
Because of this, although counter-intuitive, using "shared
key" authentication
(which involves sending known plaintext) is less secure than using
"open" authentication when WEP is enabled.
Devices may alternate among all of the configured WEP keys
when transmitting
packets. Therefore, all configured keys (up to four)
must agree.
an(4), wi(4), hostname.if(5), ifconfig(8), wicontrol(8)
The ancontrol command first appeared in FreeBSD 3.0 and
OpenBSD 2.7.
The ancontrol command was written by Bill Paul
<[email protected]>
and ported to OpenBSD by
Michael Shalayeff <[email protected]>.
The statistics counters do not seem to show the amount of
transmit and
received frames as increasing. This is likely due to the
fact that the
an(4) driver uses unmodified packet mode instead of letting
the NIC perform
802.11/Ethernet encapsulation itself.
Setting the channel does not seem to have any effect.
OpenBSD 3.6 September 10, 1999
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