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BWI(4)                   BSD Kernel Interfaces Manual                   BWI(4)

NAME
     bwi -- Broadcom AirForce IEEE 802.11b/g wireless network device

SYNOPSIS
     bwi* at cardbus?
     bwi* at pci?

DESCRIPTION
     The bwi driver provides support for Broadcom AirForce based PCI/Cardbus
     network adapters.

     These are the modes the bwi driver can operate in:

     BSS mode       Also known as infrastructure mode, this is used when asso-
                    ciating with an access point, through which all traffic
                    passes.  This mode is the default.

     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.

     The bwi driver can be configured to use Wired Equivalent Privacy (WEP) or
     Wi-Fi Protected Access (WPA-PSK and WPA2-PSK).  WPA is the current
     encryption standard for wireless networks.  It is strongly recommended
     that WEP not be used as the sole mechanism to secure wireless communica-
     tion, due to serious weaknesses in it.  The bwi driver relies on the
     software 802.11 stack for both encryption and decryption of data frames.

     The transmit speed is user-selectable or can be adapted automatically by
     the driver depending on the received signal strength and on the number of
     hardware transmission retries.

     The bwi driver can be configured at runtime with ifconfig(8) or on boot
     with hostname.if(5).

FILES
     The driver needs a firmware file which is loaded when an interface is
     brought up:

           /etc/firmware/bwi-airforce

     A prepackaged version of the firmware can be installed using
     fw_update(1).

HARDWARE
     The following cards are among those supported by the bwi driver:

           Card                      Chip       Bus        Standard
           Apple Airport Extreme     BCM4306    PCI        b/g
           Apple Airport Extreme     BCM4318    PCI        b/g
           ASUS WL-138g              BCM4318    PCI        b/g
           Buffalo WLI-CB-G54        BCM4306    CardBus    b/g
           Compaq R4035 onboard      BCM4306    PCI        b/g
           HP nx6125                 BCM4319    PCI        b/g
           Linksys WPC54G Ver 3      BCM4318    CardBus    b/g
           Linksys WPC54GS Ver 2     BCM4318    CardBus    b/g
           TRENDnet TEW-401PCplus    BCM4306    CardBus    b/g
           US Robotics 5411          BCM4318    CardBus    b/g

EXAMPLES
     The following example scans for available networks:

           # ifconfig bwi0 scan

     The following hostname.if(5) example configures bwi0 to join network
     ``mynwid'', using WPA key ``mywpakey'', obtaining an IP address using
     DHCP:

           nwid mynwid
           wpakey mywpakey
           dhcp

SEE ALSO
     arp(4), cardbus(4), ifmedia(4), intro(4), netintro(4), pci(4),
     hostname.if(5), ifconfig(8)

HISTORY
     The bwi driver first appeared in OpenBSD 4.3.

AUTHORS
     The bwi driver was written for DragonFly by Sepherosa Ziehau and ported
     to OpenBSD by Jonathan Gray and Marcus Glocker.

CAVEATS
     Some chips are incorrectly calibrated due to the lack of documentation,
     which can slow the amount of traffic to the point of being unusable.
     Furthermore this driver only supports firmware version 3.

BSD                             March 28, 2017                             BSD