PGT(4)                    OpenBSD Programmer's Manual                   PGT(4)

NAME
     pgt - Conexant/Intersil Prism GT Full-MAC IEEE 802.11a/b/g wireless net-
     work device

SYNOPSIS
     pgt* at cardbus?
     pgt* at pci?

DESCRIPTION
     The pgt driver provides support for Conexant/Intersil GT-series devices
     which can support the Full-Mac firmwares, using the ISL3877, ISL3880, and
     ISL3890 chips.  The pgt driver will not (yet) work on similar devices us-
     ing the ISL3886 or similar chips which use the Soft-Mac firmwares.

     These are the modes the pgt 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.

     IBSS mode      Also known as IEEE ad-hoc mode or 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.

     Host AP        In this mode the driver acts as an access point (base sta-
                    tion) for other cards.

     monitor mode   In this mode the driver is able to receive packets without
                    associating with an access point.  This disables the in-
                    ternal receive filter and enables the card to capture
                    packets from networks which it wouldn't normally have ac-
                    cess to, or to scan for access points.

     The pgt driver can be configured to use hardware Wired Equivalent Privacy
     (WEP).  It is strongly recommended that WEP not be used as the sole mech-
     anism to secure wireless communication, due to serious weaknesses in it.

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

FILES
     The driver needs a set of firmware files which are loaded when an inter-
     face is brought up:

           /etc/firmware/pgt-isl3877
           /etc/firmware/pgt-isl3890

     These firmware files are not free because Conexant refuses to grant dis-
     tribution rights.  In fact they have rebuffed thousands of attempts to
     start a dialogue on this issue.  As a result, even though OpenBSD in-
     cludes the driver, the firmware files cannot be included and users have
     to download these files on their own.

     A prepackaged version of the firmware, designed to be used with
     pkg_add(1), can be found at:

           http://www.nazgul.ch/pgt/pgt-firmware-1.2.tgz

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

           Card                                   Chip       Bus
           3COM 3CRWE154G72                       ISL3880    CardBus
           D-Link DWL-g650 A1                     ISL3890    PCI
           I-O Data WN-G54/CB                     ISL3890    PCI
           I4 Z-Com XG-600                        ISL3890    PCI
           I4 Z-Com XG-900                        ISL3890    PCI
           Intersil PRISM Indigo                  ISL3877    PCI
           Intersil PRISM Duette                  ISL3890    PCI
           NETGEAR WG511 (Taiwanese, not Chinese) ISL3890    CardBus
           PLANEX GW-DS54G                        ISL3890    PCI
           SMC EZ Connect g 2.4GHz SMC2802W       ISL3890    PCI
           SMC EZ Connect g 2.4GHz SMC2835W-v2    ISL3890    CardBus
           SMC 2802Wv2                            ISL3890    PCI
           Soyo Aerielink                         ISL3890    CardBus
           ZyXEL ZyAIR G-100                      ISL3890    CardBus

EXAMPLES
     The following hostname.if(5) example configures pgt0 to join whatever
     network is available on boot, using WEP key ``0x1deadbeef1'', channel 11,
     obtaining an IP address using DHCP:

           dhcp NONE NONE NONE nwkey 0x1deadbeef1 chan 11

     The following hostname.if(5) example creates a host-based access point on
     boot:

           inet 192.168.1.1 255.255.255.0 NONE media autoselect \
                   mediaopt hostap nwid my_net chan 11

     Configure pgt0 for WEP, using hex key ``0x1deadbeef1'':

           # ifconfig pgt0 nwkey 0x1deadbeef1

     Return pgt0 to its default settings:

           # ifconfig pgt0 -bssid -chan media autoselect \
                   nwid "" -nwkey

     Join an existing BSS network, ``my_net'':

           # ifconfig pgt0 192.168.1.1 netmask 0xffffff00 nwid my_net

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

HISTORY
     The pgt driver first appeared in OpenBSD 4.0.

AUTHORS
     The pgt driver was originally written for FreeBSD by Brian Fundakowski,
     and then rewritten for OpenBSD by Marcus Glocker and Claudio Jeker.

CAVEATS
     Host AP mode doesn't support power saving.  Clients attempting to use
     power saving mode may experience significant packet loss (disabling power
     saving on the client will fix this).

OpenBSD 4.7                     January 3, 2010                              2
