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IWCONFIG(8)                Linux Programmer's Manual               IWCONFIG(8)

NAME
       iwconfig - configure a wireless network interface

SYNOPSIS
       iwconfig [interface]
       iwconfig interface [essid X] [nwid N] [mode M] [freq F]
                          [channel C][sens S ][ap A ][nick NN ]
                          [rate R] [rts RT] [frag FT] [txpower T]
                          [enc E] [key K] [power P] [retry R]
                          [modu M] [commit]
       iwconfig --help
       iwconfig --version

DESCRIPTION
       Iwconfig  is  similar  to ifconfig(8), but is dedicated to the wireless
       interfaces. It is used to set the parameters of the  network  interface
       which  are  specific  to the wireless operation (for example : the fre-
       quency).  Iwconfig may also be used to display  those  parameters,  and
       the wireless statistics (extracted from /proc/net/wireless).

       All  these  parameters and statistics are device dependent. Each driver
       will provide only some of them depending on hardware support,  and  the
       range of values may change. Please refer to the man page of each device
       for details.

PARAMETERS
       essid  Set the ESSID (or Network Name - in some products it may also be
              called Domain ID). The ESSID is used to identify cells which are
              part of the same virtual network.
              As opposed to the AP Address or NWID which define a single cell,
              the  ESSID  defines  a group of cells connected via repeaters or
              infrastructure, where the user may roam transparently.
              With some cards, you  may  disable  the  ESSID  checking  (ESSID
              promiscuous) with off or any (and on to reenable it).
              If  the  ESSID  of  your  network is one of the special keywords
              (off, on or any), you should use -- to escape it.
              Examples :
                   iwconfig eth0 essid any
                   iwconfig eth0 essid "My Network"
                   iwconfig eth0 essid -- "ANY"

       nwid   Set the Network ID. As all adjacent wireless networks share  the
              same  medium, this parameter is used to differentiate them (cre-
              ate logical colocated networks) and identify nodes belonging  to
              the same cell.
              This  parameter is only used for pre-802.11 hardware, the 802.11
              protocol uses the ESSID and AP Address for this function.
              With some cards, you may disable the Network ID  checking  (NWID
              promiscuous) with off (and on to reenable it).
              Examples :
                   iwconfig eth0 nwid AB34
                   iwconfig eth0 nwid off

       nick[name]
              Set  the  nickname, or the station name. Some 802.11 products do
              define it, but this is not used as far as  the  protocols  (MAC,
              IP, TCP) are concerned and completely useless as far as configu-
              ration goes. Only some wireless diagnostic tools may use it.
              Example :
                   iwconfig eth0 nickname "My Linux Node"

       mode   Set the operating mode of the device, which depends on the  net-
              work  topology. The mode can be Ad-Hoc (network composed of only
              one cell and without Access Point), Managed (node connects to  a
              network  composed  of  many Access Points, with roaming), Master
              (the node is the synchronisation master or  acts  as  an  Access
              Point),  Repeater (the node forwards packets between other wire-
              less  nodes),  Secondary  (the  node  acts  as  a  backup   mas-
              ter/repeater), Monitor (the node is not associated with any cell
              and passively monitor all packets on the frequency) or Auto.
              Example :
                   iwconfig eth0 mode Managed
                   iwconfig eth0 mode Ad-Hoc

       freq/channel
              Set the operating frequency or channel in the  device.  A  value
              below 1000 indicates a channel number, a value greater than 1000
              is a frequency in Hz. You may append the suffix k, M or G to the
              value  (for  example,  "2.46G"  for  2.46 GHz frequency), or add
              enough '0'.
              Channels are usually numbered starting at 1,  and  you  may  use
              iwlist(8)  to  get the total number of channels, list the avail-
              able frequencies, and display the current frequency as  a  chan-
              nel. Depending on regulations, some frequencies/channels may not
              be available.
              When using Managed mode, most often the  Access  Point  dictates
              the  channel  and  the driver may refuse the setting of the fre-
              quency. In Ad-Hoc mode, the frequency setting may only  be  used
              at  initial  cell  creation,  and may be ignored when joining an
              existing cell.
              You may also use off or auto to let the card pick  up  the  best
              channel (when supported).
              Examples :
                   iwconfig eth0 freq 2422000000
                   iwconfig eth0 freq 2.422G
                   iwconfig eth0 channel 3
                   iwconfig eth0 channel auto

       ap     Force  the  card  to  register  to the Access Point given by the
              address, if it is possible. This address is the cell identity of
              the Access Point, as reported by wireless scanning, which may be
              different from its network MAC address. If the wireless link  is
              point to point, set the address of the other end of the link. If
              the link is ad-hoc, set the cell identity of the ad-hoc network.
              When  the quality of the connection goes too low, the driver may
              revert back to automatic mode (the card selects the best  Access
              Point in range).
              You  may also use off to re-enable automatic mode without chang-
              ing the current Access Point, or you may  use  any  or  auto  to
              force  the  card  to  reassociate with the currently best Access
              Point.
              Example :
                   iwconfig eth0 ap 00:60:1D:01:23:45
                   iwconfig eth0 ap any
                   iwconfig eth0 ap off

       rate/bit[rate]
              For cards supporting multiple bit rates,  set  the  bit-rate  in
              b/s.  The  bit-rate  is  the speed at which bits are transmitted
              over the medium, the user speed of the  link  is  lower  due  to
              medium sharing and various overhead.
              You may append the suffix k, M or G to the value (decimal multi-
              plier : 10^3, 10^6 and 10^9 b/s),  or  add  enough  '0'.  Values
              below  1000  are card specific, usually an index in the bit-rate
              list. Use auto to select automatic bit-rate  mode  (fallback  to
              lower  rate  on  noisy  channels), which is the default for most
              cards, and fixed to revert back to fixed setting. If you specify
              a  bit-rate  value and append auto, the driver will use all bit-
              rates lower and equal than this value.
              Examples :
                   iwconfig eth0 rate 11M
                   iwconfig eth0 rate auto
                   iwconfig eth0 rate 5.5M auto

       txpower
              For cards supporting multiple transmit powers, sets the transmit
              power in dBm. If W is the power in Watt, the power in dBm is P =
              30 + 10.log(W).  If the value is postfixed by  mW,  it  will  be
              automatically converted to dBm.
              In  addition,  on and off enable and disable the radio, and auto
              and fixed enable and disable power control  (if  those  features
              are available).
              Examples :
                   iwconfig eth0 txpower 15
                   iwconfig eth0 txpower 30mW
                   iwconfig eth0 txpower auto
                   iwconfig eth0 txpower off

       sens   Set  the sensitivity threshold. This define how sensitive is the
              card to poor operating conditions  (low  signal,  interference).
              Positive  values  are  assumed  to  be the raw value used by the
              hardware or a percentage, negative values are assumed to be dBm.
              Depending  on  the  hardware  implementation, this parameter may
              control various functions.
              On modern cards, this parameter usually control handover/roaming
              threshold,  the  lowest  signal  level  for  which  the hardware
              remains associated with the current Access Point. When the  sig-
              nal  level goes below this threshold the card starts looking for
              a new/better Access Point. Some cards  may  use  the  number  of
              missed  beacons  to  trigger  this.  For  high density of Access
              Points, a higher threshold make sure the card is always  associ-
              ated with the best AP, for low density of APs, a lower threshold
              minimise the number of failed handoffs.
              On more ancient card this parameter usually controls  the  defer
              threshold,  the  lowest signal level for which the hardware con-
              siders the channel busy. Signal levels above this threshold make
              the  hardware  inhibits  its  own  transmission  whereas signals
              weaker than this are ignored and the hardware is free to  trans-
              mit.  This  is usually strongly linked to the receive threshold,
              the lowest signal level for which the hardware  attempts  packet
              reception.  Proper  setting of these thresholds prevent the card
              to waste time on background noise  while  still  receiving  weak
              transmissions.  Modern designs seems to control those thresholds
              automatically.
              Example :
                   iwconfig eth0 sens -80
                   iwconfig eth0 sens 2

       retry  Most cards have MAC retransmissions, and some allow to  set  the
              behaviour of the retry mechanism.
              To set the maximum number of retries, enter limit `value'.  This
              is an absolute value (without unit), and the default (when noth-
              ing  is  specified).   To set the maximum length of time the MAC
              should retry, enter lifetime `value'.  By defaults,  this  value
              is  in  seconds,  append  the suffix m or u to specify values in
              milliseconds or microseconds.
              You can also add the short, long, min and max modifiers. If  the
              card  supports  automatic  mode,  they  define the bounds of the
              limit or lifetime. Some  other  cards  define  different  values
              depending on packet size, for example in 802.11 min limit is the
              short retry limit (non RTS/CTS packets).
              Examples :
                   iwconfig eth0 retry 16
                   iwconfig eth0 retry lifetime 300m
                   iwconfig eth0 retry short 12
                   iwconfig eth0 retry min limit 8

       rts[_threshold]
              RTS/CTS adds a handshake before each packet transmission to make
              sure  that  the  channel  is  clear.  This  adds  overhead,  but
              increases performance in case of hidden nodes or a large  number
              of  active  nodes.  This parameter sets the size of the smallest
              packet for which the node sends RTS ; a value equal to the maxi-
              mum  packet  size  disables the mechanism. You may also set this
              parameter to auto, fixed or off.
              Examples :
                   iwconfig eth0 rts 250
                   iwconfig eth0 rts off

       frag[mentation_threshold]
              Fragmentation allows to split an IP packet in a burst of smaller
              fragments  transmitted  on  the  medium. In most cases this adds
              overhead, but in a very noisy environment this reduces the error
              penalty  and  allow  packets to get through interference bursts.
              This parameter sets the maximum fragment size  which  is  always
              lower than the maximum packet size.
              This parameter may also control Frame Bursting available on some
              cards, the ability to send multiple IP  packets  together.  This
              mechanism  would  be enabled if the fragment size is larger than
              the maximum packet size.
              You may also set this parameter to auto, fixed or off.
              Examples :
                   iwconfig eth0 frag 512
                   iwconfig eth0 frag off

       key/enc[ryption]
              Used to manipulate encryption or scrambling  keys  and  security
              mode.
              To  set  the  current  encryption key, just enter the key in hex
              digits as XXXX-XXXX-XXXX-XXXX or XXXXXXXX.  To set a  key  other
              than  the  current  key,  prepend  or  append [index] to the key
              itself (this won't change which is the active key). You can also
              enter  the  key  as  an  ASCII  string  by  using the s: prefix.
              Passphrase is currently not supported.
              To change which key is the  currently  active  key,  just  enter
              [index] (without entering any key value).
              off and on disable and reenable encryption.
              The  security  mode  may  be open or restricted, and its meaning
              depends on the card used. With  most  cards,  in  open  mode  no
              authentication  is  used  and  the  card  may  also  accept non-
              encrypted sessions, whereas in restricted  mode  only  encrypted
              sessions  are  accepted  and the card will use authentication if
              available.
              If you need to set multiple keys, or set a key  and  change  the
              active  key,  you need to use multiple key directives. Arguments
              can be put in any order, the last one will take precedence.
              Examples :
                   iwconfig eth0 key 0123-4567-89
                   iwconfig eth0 key [3] 0123-4567-89
                   iwconfig eth0 key s:password [2]
                   iwconfig eth0 key [2]
                   iwconfig eth0 key open
                   iwconfig eth0 key off
                   iwconfig eth0 key restricted [3] 0123456789
                   iwconfig eth0 key 01-23 key 45-67 [4] key [4]

       power  Used to manipulate power management scheme parameters and  mode.
              To  set  the  period between wake ups, enter period `value'.  To
              set the timeout  before  going  back  to  sleep,  enter  timeout
              `value'.  To set the generic level of power saving, enter saving
              `value'.  You can  also  add  the  min  and  max  modifiers.  By
              default,  those  values are in seconds, append the suffix m or u
              to specify values in milliseconds  or  microseconds.  Sometimes,
              those values are without units (number of beacon periods, dwell,
              percentage or similar).
              off and on disable and reenable power management.  Finally,  you
              may  set the power management mode to all (receive all packets),
              unicast (receive unicast packets  only,  discard  multicast  and
              broadcast)  and multicast (receive multicast and broadcast only,
              discard unicast packets).
              Examples :
                   iwconfig eth0 power period 2
                   iwconfig eth0 power 500m unicast
                   iwconfig eth0 power timeout 300u all
                   iwconfig eth0 power saving 3
                   iwconfig eth0 power off
                   iwconfig eth0 power min period 2 power max period 4

       modu[lation]
              Force the card to use a  specific  set  of  modulations.  Modern
              cards support various modulations, some which are standard, such
              as 802.11b or 802.11g, and some proprietary. This command  force
              the  card  to only use the specific set of modulations listed on
              the command line. This  can  be  used  to  fix  interoperability
              issues.
              The  list of available modulations depend on the card/driver and
              can be  displayed  using  iwlist  modulation.   Note  that  some
              card/driver  may  not  be  able to select each modulation listed
              independently, some may come as a group. You may also  set  this
              parameter to auto let the card/driver do its best.
              Examples :
                   iwconfig eth0 modu 11g
                   iwconfig eth0 modu CCK OFDMa
                   iwconfig eth0 modu auto

       commit Some  cards  may  not apply changes done through Wireless Exten-
              sions immediately (they may wait to  aggregate  the  changes  or
              apply  it  only when the card is brought up via ifconfig).  This
              command (when available) forces the card to  apply  all  pending
              changes.
              This  is  normally  not needed, because the card will eventually
              apply the changes, but can be useful for debugging.

DISPLAY
       For each device which supports wireless extensions, iwconfig will  dis-
       play  the name of the MAC protocol used (name of device for proprietary
       protocols), the ESSID (Network Name), the NWID, the frequency (or chan-
       nel), the sensitivity, the mode of operation, the Access Point address,
       the bit-rate, the  RTS  threshold,  the  fragmentation  threshold,  the
       encryption  key  and the power management settings (depending on avail-
       ability).

       The parameters displayed have the same meaning and values as the param-
       eters  you  can  set,  please refer to the previous part for a detailed
       explanation of them.
       Some parameters are only displayed in short/abbreviated form  (such  as
       encryption). You may use iwlist(8) to get all the details.
       Some  parameters have two modes (such as bitrate). If the value is pre-
       fixed by `=', it means that the parameter is fixed and forced  to  that
       value, if it is prefixed by `:', the parameter is in automatic mode and
       the current value is shown (and may change).

       Access Point/Cell
              An address equal to 00:00:00:00:00:00 means that the card failed
              to  associate  with an Access Point (most likely a configuration
              issue). The Access Point parameter will be shown as Cell in  ad-
              hoc mode (for obvious reasons), but otherwise works the same.

       If  /proc/net/wireless  exists, iwconfig will also display its content.
       Note that those values will depend  on  the  driver  and  the  hardware
       specifics, so you need to refer to your driver documentation for proper
       interpretation of those values.

       Link quality
              Overall quality of the link. May be based on the level  of  con-
              tention  or  interference, the bit or frame error rate, how good
              the received signal is, some timing  synchronisation,  or  other
              hardware metric. This is an aggregate value, and depends totally
              on the driver and hardware.

       Signal level
              Received signal strength (RSSI - how strong the received  signal
              is).  May  be  arbitrary units or dBm, iwconfig uses driver meta
              information to interpret the raw value given by  /proc/net/wire-
              less  and  display the proper unit or maximum value (using 8 bit
              arithmetic). In Ad-Hoc mode,  this  may  be  undefined  and  you
              should use iwspy.

       Noise level
              Background  noise level (when no packet is transmitted). Similar
              comments as for Signal level.

       Rx invalid nwid
              Number of packets received with a different NWID or ESSID.  Used
              to  detect  configuration problems or adjacent network existence
              (on the same frequency).

       Rx invalid crypt
              Number of packets that the hardware was unable to decrypt.  This
              can be used to detect invalid encryption settings.

       Rx invalid frag
              Number  of  packets for which the hardware was not able to prop-
              erly re-assemble the link layer fragments (most likely  one  was
              missing).

       Tx excessive retries
              Number  of packets that the hardware failed to deliver. Most MAC
              protocols will retry the packet a number of times before  giving
              up.

       Invalid misc
              Other  packets  lost  in  relation with specific wireless opera-
              tions.

       Missed beacon
              Number of periodic beacons from the Cell or the Access Point  we
              have  missed.  Beacons are sent at regular intervals to maintain
              the cell coordination, failure to receive them usually indicates
              that the card is out of range.

AUTHOR
       Jean Tourrilhes - jt@hpl.hp.com

FILES
       /proc/net/wireless

SEE ALSO
       ifconfig(8), iwspy(8), iwlist(8), iwevent(8), iwpriv(8), wireless(7).

wireless-tools                   30 March 2006                     IWCONFIG(8)
 

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