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ANCONTROL(8)		  BSD System Manager's Manual		  ANCONTROL(8)

     ancontrol -- configure Aironet 4500/4800 devices

     ancontrol -i iface	-A
     ancontrol -i iface	-N
     ancontrol -i iface	-S
     ancontrol -i iface	-I
     ancontrol -i iface	-T
     ancontrol -i iface	-C
     ancontrol -i iface	-Q
     ancontrol -i iface	-Z
     ancontrol -i iface	-R
     ancontrol -i iface	-t 0-4
     ancontrol -i iface	-s 0-3
     ancontrol -i iface	[-v 1-4] -a AP
     ancontrol -i iface	-b beacon_period
     ancontrol -i iface	[-v 0 |	1] -d 0-3
     ancontrol -i iface	-e 0-4
     ancontrol -i iface	[-v 0-8] -k key
     ancontrol -i iface	-K 0-2
     ancontrol -i iface	-W 0-2
     ancontrol -i iface	-L user_name
     ancontrol -i iface	-j netjoin_timeout
     ancontrol -i iface	-l station_name
     ancontrol -i iface	-m mac_address
     ancontrol -i iface	[-v 1-3] -n SSID
     ancontrol -i iface	-o 0 | 1
     ancontrol -i iface	-p tx_power
     ancontrol -i iface	-c frequency
     ancontrol -i iface	-f fragmentation_threshold
     ancontrol -i iface	-r RTS_threshold
     ancontrol -i iface	-M 0-15
     ancontrol -h

     The ancontrol utility controls the	operation of Aironet wireless network-
     ing 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	imple-
     ment.  This includes such things as 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.  The ancontrol utility can also be
     used to view the current NIC status, configuration	and to dump out	the
     values of the card's statistics counters.

     The iface argument	given to ancontrol should be the logical interface
     name associated with the Aironet device (an0, an1,	etc.).	If one is not
     specified the device "an0"	will be	assumed.

     The ancontrol utility is not designed to support the combination of argu-
     ments from	different SYNOPSIS lines in a single ancontrol invocation, and
     such combinations are not recommended.

     The options are as	follows:

     -i	iface -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.

     -i	iface -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.

     -i	iface -S
	     Display NIC status	information.  This includes the	current	oper-
	     ating 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 asso-
	     ciated 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.

     -i	iface -I
	     Display NIC capability information.  This shows the device	type,
	     frequency,	speed and power	level capabilities and firmware	revi-
	     sion levels.

     -i	iface -T
	     Display the NIC's internal	statistics counters.

     -i	iface -C
	     Display current NIC configuration.	 This shows the	current	opera-
	     tion mode,	receive	mode, MAC address, power save settings,	vari-
	     ous timing	settings, channel selection, diversity,	transmit power
	     and transmit speed.

     -i	iface -Q
	     Display the cached	signal strength	information maintained by the
	     an(4) driver.  The	driver retains information about signal
	     strength and noise	level for packets received from	different
	     hosts.  The signal	strength and noise level values	are displayed
	     in	units of dBms by default.  The sysctl(8)
	     variable can be set to raw, dbm or	per.

     -i	iface -Z
	     Clear the signal strength cache maintained	internally by the
	     an(4) driver.

     -i	iface -R
	     Display RSSI map that converts from the RSSI index	to percent and

     -i	iface -t 0-4
	     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.

     -i	iface -s 0-3
	     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	(PSP-CAM)

	     Note that for IBSS	(ad-hoc) mode, only PSP	mode is	supported, and
	     only if the ATIM window is	non-zero.

     -i	iface [-v 1-4] -a AP
	     Set preferred access point.  The AP is specified as a MAC address
	     consisting	of 6 hexadecimal values	separated by colons.  By de-
	     fault, the	-a option only sets the	first entry in the AP list.
	     The -v modifier can be used to specify exactly which AP list en-
	     try is to be modified.  If	the -v flag is not used, the first AP
	     list entry	will be	changed.

     -i	iface -b beacon_period
	     Set the ad-hoc mode beacon	period.	 The beacon_period is speci-
	     fied in milliseconds.  The	default	is 100ms.

     -i	iface [-v 0 | 1] -d 0-3
	     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.

     -i	iface -e 0-4
	     Set the transmit WEP key to use.  Note that until this command is
	     issued, the device	will use the last key programmed.  The trans-
	     mit key is	stored in NVRAM.  Currently set	transmit key can be
	     checked via -C option.  Selection 4 sets the card in "Home
	     Network Mode" and uses the	home key.

     -i	iface [-v 0-8] -k key
	     Set a WEP key.  For 40 bit	prefix 10 hex character	with 0x.  For
	     128 bit prefix 26 hex character with 0x.  Use "" as the key to
	     erase the key.  Supports 4	keys; even numbers are for permanent
	     keys and odd number 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	-C option, only	the sizes of the keys are re-
	     turned.  The value	of 8 is	for the	home key.  Note	that the value
	     for the home key can be read back from firmware.

     -i	iface -K 0-2
	     Set authorization type.  Use 0 for	none, 1	for "Open", 2 for
	     "Shared Key".

     -i	iface -W 0-2
	     Enable WEP.  Use 0	for no WEP, 1 to enable	full WEP, 2 for	mixed

     -i	iface -L user_name
	     Enable LEAP and query for password.  It will check	to see if it
	     has authenticated for up to 60s.  To disable LEAP,	set WEP	mode.

     -i	iface -j netjoin_timeout
	     Set the ad-hoc network join timeout.  When	a station is first ac-
	     tivated 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 suit-
	     able 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.

     -i	iface -l station_name
	     Set the station name used internally by the NIC.  The
	     station_name can be any text string up to 16 characters in
	     length.  The default name is set by the driver to "FreeBSD".

     -i	iface -m mac_address
	     Set the station address for the specified interface.  The
	     mac_address 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.

     -i	iface [-v 1-3] -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 is not
	     used, the first SSID in the list is set.

     -i	iface -o 0 | 1
	     Set the operating mode of the Aironet interface.  Valid selec-
	     tions are 0 for ad-hoc mode and 1 for infrastructure mode.	 The
	     default driver setting is for infrastructure mode.

     -i	iface -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.

     -i	iface -c frequency
	     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 regula-
	     tions 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	chan-
	     nel is 14.	 Note that two stations	must be	set to the same	chan-
	     nel in order to communicate.

     -i	iface -f fragmentation_threshold
	     Set the fragmentation threshold in	bytes.	This threshold con-
	     trols the point at	which outgoing packets will be split into mul-
	     tiple 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.

     -i	iface -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.

     -i	iface -M 0-15
	     Set monitor mode via bit mask, meaning:

		   Bit	   Meaning
		   0	   to not dump 802.11 packet.
		   1	   to enable 802.11 monitor.
		   2	   to monitor any SSID.
		   4	   to not skip beacons,	monitor	beacons	produces a
			   high	system load.
		   8	   to enable full Aironet header returned via BPF.
			   Note	it appears that	a SSID must be set.

     -h	     Print a list of available options and sample usage.

     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, espe-
     cially 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" authenti-
     cation (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 transmit-
     ting packets.  Therefore, all configured keys (up to four)	must agree.

	   ancontrol -i	an0 -v 0 -k 0x12345678901234567890123456
	   ancontrol -i	an0 -K 2
	   ancontrol -i	an0 -W 1
	   ancontrol -i	an0 -e 0

     Sets a WEP	key 0, enables "Shared Key" authentication, enables full WEP
     and uses transmit key 0.

     an(4), ifconfig(8)

     The ancontrol utility first appeared in FreeBSD 4.0.

     The ancontrol utility was written by Bill Paul <>.

     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 per-
     form 802.11/ethernet encapsulation	itself.

     Setting the channel does not seem to have any effect.

BSD			      September	10, 1999			   BSD


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