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ancontrol - configure Aironet 4500/4800 devices



      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
              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.
      -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
              returned.  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
              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 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.


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