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RTW(4)                   BSD Kernel Interfaces Manual                   RTW(4)

     rtw -- Realtek RTL8180L IEEE 802.11b wireless network device

     rtw* at cardbus?
     rtw* at pci?

     The rtw driver supports PCI/CardBus 802.11b wireless adapters based on
     the Realtek RTL8180L.

     A variety of radio transceivers can be found in these devices, including
     the Philips SA2400A, Maxim MAX2820, and GCT GRF5101.

     These are the modes the rtw 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
                    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 rtw driver can be configured to use software 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 rtw driver can be configured at runtime with ifconfig(8) or on boot
     with hostname.if(5).

     The following adapters should work:

           Card                              Radio      Bus
           Allnet ALL0182                    SA2400     CardBus
           Belkin F5D6020 V3                 SA2400     CardBus
           Buffalo WLI-CB-B11                SA2400     CardBus
           Corega CG-WLCB11V3                SA2400     CardBus
           D-Link DWL-610                    ?          CardBus
           Edimax EW-7106                    SA2400     CardBus
           GigaFast WF721-AEX (R* serial)    GRF5101    CardBus
           Jensen AirLink 6011               GRF5101    CardBus
           Level-One WPC-0101                SA2400     CardBus
           Linksys WPC11 v4                  MAX2820    CardBus
           Netgear MA521                     SA2400     CardBus
           Ovislink AirLive WL-1120PCM       SA2400     CardBus
           Planet WL-3553                    SA2400     CardBus
           Q-Tec 770WC                       SA2400     CardBus
           Q-Tec 775WC                       SA2400     CardBus
           Roper FreeLan 802.11b             SA2400     CardBus
           SAFECOM SWLCR-1100                SA2400     CardBus
           TRENDnet TEW-226PC                ?          CardBus
           VCTnet PC-11B1                    SA2400     CardBus
           Winstron CB-200B                  SA2400     CardBus
           Zonet ZEW1000                     GRF5101    CardBus

     The following example scans for available networks:

           # ifconfig rtw0 scan

     The following hostname.if(5) example configures rtw0 to join network
     ``mynwid'', using WEP key ``mywepkey'', obtaining an IP address using

           nwid mynwid
           nwkey mywepkey

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

           mediaopt hostap
           nwid mynwid
           nwkey mywepkey

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

     Realtek, http://www.realtek.com.tw.

     The rtw device driver first appeared in OpenBSD 3.7.

     The rtw driver was written by David Young <dyoung@NetBSD.org> and ported
     to OpenBSD by Jonathan Gray <jsg@openbsd.org>.

     GCT refuse to release any documentation on their GRF5101 RF transceiver.

     While PCI devices will attach most of them are not able to transmit.

     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).

BSD                              July 16, 2013                             BSD