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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]
[commit]
iwconfig --help
iwconfig --version

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sens Set the sensitivity threshold. This is the lowest signal level
for which the hardware will consider receive packets usable.
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.
This parameter may control the receive threshold, the lowest
signal level for which the hardware attempts packet reception,
signals weaker than this are ignored. This may also controls the
defer threshold, the lowest signal level for which the hardware
considers the channel busy. Proper setting of those threshold
prevent the card to waste time receiving background noise. Mod-
ern designs seems to control those thresholds automatically.
On modern cards, this parameter may 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.
Example :
iwconfig eth0 sens -80
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���. 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
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 off
iwconfig eth0 power min period 2 power max period 4

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

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