.br
.BI "iwconfig " interface " [essid " X "] [nwid " N "] [freq " F "] [channel " C ]
.br
-.BI " [sens " S "] [enc " E "] [ap " A "] [nick " NN ]
+.BI " [sens " S "] [mode " M "] [ap " A "] [nick " NN ]
.br
-.BI " [rate " R "] [rts " RT "] [frag " FT ]
+.BI " [rate " R "] [rts " RT "] [frag " FT "] [txpower " T ]
+.br
+.BI " [enc " E "] [key " K "] [power " P "] [retry " R ]
+.br
+.BI " [commit]
.\"
.\" DESCRIPTION part
.\"
a group of cell connected via repeaters or infrastructure, where the
user may roam. With some card, you may disable the ESSID checking
(ESSID promiscuous) with
-.IR off " (and " on
+.IR off " or " any " (and " on
to reenable it).
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 essid any"
+.br
+.I " iwconfig eth0 essid ""My Network""
.TP
.BR nwid / domain
Set the Network ID (in some products it is also called Domain ID). As
disable the Network ID checking (NWID promiscuous) with
.IR off " (and " on
to reenable it).
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 nwid AB34
+.br
+.I " iwconfig eth0 nwid off"
.TP
.BR freq / channel
Set the operating frequency or channel in the device. Value below 1000
are the channel number, value over this is the frequency in Hz. You
-must prepend the suffix k, M or G to the value (for example, "2.46G"
+must append the suffix k, M or G to the value (for example, "2.46G"
for 2.46 GHz frequency), or add enough '0'.
.br
Channels are usually numbered starting at 1,
to get the total number of channels and list the available
frequencies. Depending on regulations, some frequencies/channels may
not be available.
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 freq 2.422G"
+.br
+.I " iwconfig eth0 channel 3"
.TP
.B sens
Set the sensitivity threshold. This is the lowest signal level for
(lowest signal level for which we consider the channel busy) and the
handover threshold (lowest signal level where we stay associated with
the current access point).
+.br
+.B Example :
+.br
+.I " iwconfig eth0 sens -80"
.TP
-.B enc
-Set the encryption or scrambing key (the syntax is
-.IR XXXX-XXXX-XXXX-XXXX " or " XXXXXXXX ).
-Used also to control the encryption feature
-.RI ( on / off ).
+.B mode
+Set the operating mode of the device, which depends on the network
+topology. The mode can be
+.I Ad-hoc
+(network composed of only one cell and without Access Point),
+.I Managed
+(network composed of many cells, with roaming or with an Access Point),
+.I Master
+(the node is the synchronisation master or act as an Access Point),
+.I Repeater
+(the node forward packets on the air),
+.I Secondary
+(the node act as a backup master/repeater) or
+.IR Auto .
+.br
+.B Example :
+.br
+.I " iwconfig eth0 mode Managed"
.TP
.B ap
-Register to the Access Point given by the address, if it is
-possible. When the quality of the connection goes too low, the driver
-may revert back to automatic mode.
+Force the card to register to the Access Point given by the address,
+if it is possible. When the quality of the connection goes too low,
+the driver may revert back to automatic mode (the card finds the best
+Access Point in range).
+.br
+You may also use
+.I off
+to re-enable automatic mode without changing the current Access Point,
+or you may use
+.I any
+or
+.I auto
+to force the card to reassociate with the current best Access Point.
+.br
+.B Example :
+.br
+.I " iwconfig eth0 ap 00:60:1D:01:23:45"
+.br
+.I " iwconfig eth0 ap any"
+.br
+.I " iwconfig eth0 ap off"
.TP
-.BR nick [ name ]
+.BR nick [name]
Set the nickname, or the station name. Most 802.11 products do define
it, but this is not used as far as the protocols (MAC, IP, TCP) are
concerned and completely accessory as far as configuration goes. In
fact only some diagnostic tools may use it.
+.br
+.B Example :
+.br
+.I " iwconfig eth0 nickname ""My Linux Node""
.TP
-.BR rate / bit [ rate ]
+.BR 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
overhead.
.br
-You must prepend the suffix k, M or G to the value (decimal multiplier
+You must append the suffix k, M or G to the value (decimal multiplier
: 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
.I auto
to select the automatic bit-rate mode (fallback to lower rate on noisy
channels), which is the default for most cards, and
.I fixed
-to revert back to fixed setting.
+to revert back to fixed setting. If you specify a bit-rate value and append
+.IR auto ,
+the driver will use all bit lower and equal than this value.
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 rate 11M"
+.br
+.I " iwconfig eth0 rate auto"
+.br
+.I " iwconfig eth0 rate 5.5M auto"
.TP
-.BR rts [ _threshold ]
+.BR rts [_threshold]
RTS/CTS adds a handshake before each packet transmission to make sure
that the channel is clear. This adds overhead, but increase
performance in case of hidden nodes or large number of active
the node sends RTS, a value equal to the maximum packet size disable
the scheme. You may also set this parameter to
.IR auto ", " fixed " or " off .
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 rts 250"
+.br
+.I " iwconfig eth0 rts off"
.TP
-.BR frag [ mentation_threshold ]
+.BR frag [mentation_threshold]
Fragmentation allow to split a IP packet in a burst of smaller
fragments transmitted on the medium. In most cases this adds overhead,
but in very noisy environment this reduce the error penalty. This
parameter set the maximum fragment size, a value equal to the maximum
packet size disable the scheme. You may also set this parameter to
.IR auto ", " fixed " or " off .
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 frag 512"
+.br
+.I " iwconfig eth0 frag off"
+.TP
+.BR key / enc [ryption]
+Used to manipulate encryption or scrambling keys and encryption mode.
+.br
+To set the current encryption key, just enter the key in hex digits as
+.IR XXXX-XXXX-XXXX-XXXX " or " XXXXXXXX .
+To set a key other than the current key, append
+.I [index]
+to the key itself. You can also enter the key as an ASCII string by
+using the
+.I s:
+prefix.
+.br
+To change which key is the current active key, just enter
+.I [index]
+(without entering any key value).
+.br
+.IR off " and " on
+disable and reenable encryption,
+.I open
+set the system in open mode (accept non-encrypted packets) and
+.I restricted
+discard non-encrypted packets.
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 key 0123-4567-89"
+.br
+.I " iwconfig eth0 key s:password [2]"
+.br
+.I " iwconfig eth0 key [2] open"
+.br
+.I " iwconfig eth0 key off"
+.TP
+.BR power
+Used to manipulate power management scheme parameters and mode.
+.br
+To set the period between wake up, enter
+.IR "period `value'" .
+To set the timeout before going back to sleep, enter
+.IR "timeout `value'" .
+You can also add the
+.IR min " and " max
+modifiers. By defaults, those values are in seconds, append the
+suffix m or u to specify values un milliseconds or
+microseconds. Sometimes, those values are without units (number of
+dwell or the like).
+.br
+.IR off " and " on
+disable and reenable power management. Finally, you may set the power
+management mode to
+.I all
+(receive all packets),
+.I unicast
+(receive unicast packets only, discard multicast and broadcast) and
+.I multicast
+(receive multicast and broadcast only, discard unicast packets).
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 power period 2"
+.br
+.I " iwconfig eth0 power 500m unicast"
+.br
+.I " iwconfig eth0 power timeout 300u all"
+.br
+.I " iwconfig eth0 power off"
+.br
+.I " iwconfig eth0 power min period 2 power max period 4"
+.TP
+.BR txpower
+For cards supporting multiple transmit powers, set the transmit power in dBm. If
+.I W
+is the power in Watt, the power in dBm is
+.IR "P = 30 + 10.log(W)" .
+If the value is postfixed by
+.IR mW ,
+it will be automatically converted to dBm.
+.br
+In addition,
+.IR on " and " off
+enable and disable the radio, and
+.IR auto " and " fixed
+enable and disable power control (if those features are available).
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 txpower 15"
+.br
+.I " iwconfig eth0 txpower 30mW"
+.br
+.I " iwconfig eth0 txpower auto"
+.br
+.I " iwconfig eth0 txpower off"
+.TP
+.BR retry
+Most cards have MAC retransmissions, and some allow to set the
+behaviour of the retry mechanism.
+.br
+To set the maximum number of retries, enter
+.IR "limit `value'" .
+This is an absolute value (without unit).
+The set the maximum length of time the MAC should retry, enter
+.IR "lifetime `value'" .
+By defaults, this value in in seconds, append the suffix m or u to
+specify values un milliseconds or microseconds.
+.br
+You can also add the
+.IR min " and " max
+modifiers. If the card support 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
+.I min limit
+is the short retry limit (non RTS/CTS packets).
+.br
+.B Examples :
+.br
+.I " iwconfig eth0 retry 16"
+.br
+.I " iwconfig eth0 retry lifetime 300m"
+.br
+.I " iwconfig eth0 retry min limit 8"
+.TP
+.BR commit
+Some cards may not apply changes done through Wireless Extensions
+immediately (they may wait to agregate the changes or apply it only
+when the card is brought up via ifconfig). This command (when
+available) force the card to apply all pending changes.
+.br
+This is normally not needed, because the card will eventually apply
+the changes, but can be usefull for debugging.
.\"
.\" DISPLAY part
.\"
(or channel), the
.BR sensitivity ,
the
+.B mode
+of operation, the
.B Access Point
address, the
.B bit-rate
-(with
-.B (f)
-if fixed), the
+the
.BR "RTS threshold" ", the " "fragmentation threshold" ,
-and the
+the
.B encryption key
-(depending on availability). See above for explanations.
+and the
+.B power management
+settings (depending on availability).
+.br
+See above for explanations of what these parameters mean.
+.br
+If the label for bitrate is followed by
+.RB ` = ',
+it means that the parameter is fixed and forced to that value, if it
+is followed by
+.RB ` : '
+it is only the current value (device in normal auto mode).
.PP
If
.I /proc/net/wireless
will also display its content :
.TP
.B Link quality
-Quality of the link or the modulation (how good the received signal is).
+Quality of the link or the modulation (what is the level of contention
+or interference, or how good the received signal is).
.TP
.B Signal level
Received signal strength (how strong the received signal is).
.\" AUTHOR part
.\"
.SH AUTHOR
-Jean Tourrilhes \- jt@hplb.hpl.hp.com
+Jean Tourrilhes \- jt@hpl.hp.com
.\"
.\" FILES part
.\"
.SH SEE ALSO
.BR ifconfig (8),
.BR iwspy (8),
+.BR iwlist (8),
.BR iwpriv (8),
.BR wavelan (4),
.BR wavelan_cs (4),
-.BR xircnw_cs (4).
+.BR wvlan_cs (4),
+.BR netwave_cs (4).
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