path: root/share/man/man4/iwi.4

.\" $OpenBSD: iwi.4,v 1.21 2005/09/19 19:59:07 damien Exp $
.\"
.\" Copyright (c) 2004
.\"	Damien Bergamini <damien.bergamini@free.fr>. All rights reserved.
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.Dd September 26, 2004
.Os
.Dt IWI 4
.Sh NAME
.Nm iwi
.Nd Intel PRO/Wireless 2200BG/2225BG/2915ABG IEEE 802.11a/b/g wireless network driver
.Sh SYNOPSIS
.Cd "iwi* at pci?"
.Sh DESCRIPTION
The
.Nm
driver provides support for
.Tn Intel
PRO/Wireless 2200BG/2915ABG Mini PCI and 2225BG PCI network adapters.
.Pp
These are the modes the
.Nm
driver can operate in:
.Bl -tag -width "IBSS-masterXX"
.It BSS mode
Also known as
.Em infrastructure
mode, this is used when associating with an access point, through
which all traffic passes.
This mode is the default.
.It IBSS mode
Also known as
.Em IEEE ad-hoc
mode or
.Em peer-to-peer
mode.
This is the standardized method of operating without an access point.
Stations associate with a service set.
However, actual connections between stations are peer-to-peer.
.It monitor mode
In this mode the driver is able to receive packets without
associating with an access point.
This disables the internal receive filter and enables the card to
capture packets from networks which it wouldn't normally have access to,
or to scan for access points.
.El
.Pp
.Nm
supports hardware WEP.
Wired Equivalent Privacy (WEP) is the de facto encryption standard
for wireless networks.
It can be typically configured in one of three modes:
no encryption; 40-bit encryption; or 104-bit encryption.
Unfortunately, due to serious weaknesses in WEP protocol
it is strongly recommended that it not be used as the
sole mechanism to secure wireless communication.
WEP is not enabled by default.
.Sh CONFIGURATION
The
.Nm
driver can be configured at runtime with
.Xr ifconfig 8
or on boot with
.Xr hostname.if 5
using the following parameters:
.Bl -tag -width Ds
.It Cm bssid Ar bssid
Set the desired BSSID.
.It Fl bssid
Unset the desired BSSID.
The interface will automatically select a BSSID in this mode, which is
the default.
.It Cm chan Ar n
Set the channel (radio frequency) to be used by the driver based on
the given channel ID
.Ar n .
.It Fl chan
Unset the desired channel to be used by the driver.
The driver will automatically select a channel in this mode, which is
the default.
.It Cm media Ar media
The
.Nm
driver supports the following
.Ar media
types:
.Pp
.Bl -tag -width autoselect -compact
.It Cm autoselect
Enable autoselection of the media type and options.
.El
.It Cm mediaopt Ar opts
The
.Nm
driver supports the following media options:
.Pp
.Bl -tag -width monitor -compact
.It Cm ibss
Select IBSS operation.
.It Cm monitor
Select monitor mode.
.El
.It Fl mediaopt Ar opts
Disable the specified media options on the driver and return it to the
default mode of operation (BSS).
.It Cm mode Ar mode
The
.Nm
driver supports the following modes:
.Pp
.Bl -tag -width 11b -compact
.It Cm 11a
Force 802.11a operation.
.It Cm 11b
Force 802.11b operation.
.It Cm 11g
Force 802.11g operation.
.El
.It Cm nwid Ar id
Set the network ID.
The
.Ar id
can either be any text string up to 32 characters in length,
or a series of hexadecimal digits up to 64 digits.
An empty
.Ar id
string allows the interface to connect to any available access points.
By default the
.Nm
driver uses an empty string.
Note that network ID is synonymous with Extended Service Set ID (ESSID).
.It Cm nwkey Ar key
Enable WEP encryption using the specified
.Ar key .
The
.Ar key
can either be a string, a series of hexadecimal digits (preceded by
.Sq 0x ) ,
or a set of keys of the form
.Dq n:k1,k2,k3,k4 ,
where
.Sq n
specifies which of the keys will be used for transmitted packets,
and the four keys,
.Dq k1
through
.Dq k4 ,
are configured as WEP keys.
If a set of keys is specified, a comma
.Pq Sq \&,
within the key must be escaped with a backslash.
Note that if multiple keys are used, their order must be the same within
the network.
.Nm
is capable of using both 40-bit (5 characters or 10 hexadecimal digits)
or 104-bit (13 characters or 26 hexadecimal digits) keys.
.It Fl nwkey
Disable WEP encryption.
This is the default mode of operation.
.El
.Sh FILES
The driver needs some firmware files,
which are loaded on demand when the device is attached:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It Pa /etc/firmware/iwi-license
.It Pa /etc/firmware/iwi-boot
.It Pa /etc/firmware/iwi-bss
.It Pa /etc/firmware/iwi-ibss
.It Pa /etc/firmware/iwi-monitor
.It Pa /etc/firmware/iwi-ucode-bss
.It Pa /etc/firmware/iwi-ucode-ibss
.It Pa /etc/firmware/iwi-ucode-monitor
.El
.Pp
These firmware files are not free because Intel refuses to grant
distribution rights without contractual obligations.
As a result, even though
.Ox
includes the driver, the firmware files cannot be included and
users have to find these files on their own.
The official person to state your views to about this issue is
peter.engelbrecht@intel.com at (858) 391 1857.
.Sh EXAMPLES
The following
.Xr hostname.if 5
example configures iwi0 to join whatever network is available on boot,
using WEP key
.Dq 0x1deadbeef1 ,
channel 11, obtaining an IP address using DHCP:
.Bd -literal -offset indent
dhcp NONE NONE NONE nwkey 0x1deadbeef1 chan 11
.Ed
.Pp
Configure iwi0 for WEP, using hex key
.Dq 0x1deadbeef1 :
.Bd -literal -offset indent
# ifconfig iwi0 nwkey 0x1deadbeef1
.Ed
.Pp
Return iwi0 to its default settings:
.Bd -literal -offset indent
# ifconfig iwi0 -bssid -chan media autoselect \e
	nwid "" -nwkey
.Ed
.Pp
Join an existing BSS network,
.Dq my_net :
.Bd -literal -offset indent
# ifconfig iwi0 192.168.1.1 netmask 0xffffff00 nwid my_net
.Ed
.Sh DIAGNOSTICS
.Bl -diag
.It "iwi%d: device timeout"
The driver will reset the hardware.
This should not happen.
.El
.Sh SEE ALSO
.Xr arp 4 ,
.Xr ifmedia 4 ,
.Xr intro 4 ,
.Xr netintro 4 ,
.Xr pci 4 ,
.Xr hostname.if 5 ,
.Xr ifconfig 8
.Rs
.%T The IWI Web Page
.%O http://damien.bergamini.free.fr/ipw/
.Re
.Sh AUTHORS
The
.Nm
driver was written by
.An Damien Bergamini Aq damien@openbsd.org .