MirBSD manpage: ancontrol(8)

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


     ancontrol - configure Aironet 4500/4800 devices


     ancontrol [interface] [-A] [-N] [-S] [-I] [-T] [-C] [-a AP]
               [-b beacon period] [-c channel number] [-v 0|1] [-d 0|1|2|3]
               [-e 0|1|2|3] [-f fragmentation threshold] [-j netjoin timeout]
               [-v 0|1|2|3|4|5|6|7] [-k key] [-K 0|1|2] [-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] [-v 1|2|3|4]
               [-W 0|1|2]


     The ancontrol command 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 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

     The interface argument given to ancontrol should be the logical interface
     name associated with the Aironet device (e.g., an0, an1, etc...).

     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 de-
             fault) 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.

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

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

     -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.

     -S      Display NIC status information. This includes the current operat-
             ing 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.

     -T      Display the NIC's internal statistics counters.

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

     -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 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.

     -b beacon period
             Set the ad-hoc mode beacon period. The beacon period is specified
             in milliseconds. The default is 100ms.

     -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 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 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. 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.

     -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.

     -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 -C option, only the sizes of the keys are returned.

     -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 "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.

     -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.

     -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

     -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 (PSP-CAM)

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

     -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.


     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 tranmit-
     ting 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 <wpaul@ee.columbia.edu>
     and ported to OpenBSD by
     Michael Shalayeff <mickey@openbsd.org>.


     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.

MirBSD #10-current            September 10, 1999                             4

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