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ZYD(4)                   BSD Kernel Interfaces Manual                   ZYD(4)

NAME
     zyd -- ZyDAS ZD1211/ZD1211B USB IEEE 802.11b/g wireless network device

SYNOPSIS
     zyd* at uhub? port ?

DESCRIPTION
     The zyd driver provides support for wireless network adapters based
     around the ZyDAS ZD1211 and ZD1211B USB chips.

     These are the modes the zyd 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 zyd 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 zyd driver relies on the
     software 802.11 stack for both encryption and decryption of data frames.

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

HARDWARE
     The following devices are known to be supported by the zyd driver:

           3COM 3CRUSB10075
           Acer WLAN-G-US1
           Airlink+ AWLL3025
           Airlink 101 AWLL3026
           AOpen 802.11g WL54
           Asus A9T integrated wireless
           Asus WL-159g
           Belkin F5D7050 v.4000
           Billion BiPAC 3011G
           Buffalo WLI-U2-KG54L
           CC&C WL-2203B
           DrayTek Vigor 550
           Edimax EW-7317UG
           Edimax EW-7317LDG
           Fiberline Networks WL-43OU
           iNexQ UR055g
           Linksys WUSBF54G
           Longshine LCS-8131G3
           MSI US54SE
           Philips SNU5600
           Planet WL-U356
           Planex GW-US54GD
           Planex GW-US54GXS
           Planex GW-US54GZL
           Planex GW-US54Mini
           Planex GW-US54ZGL
           Safecom SWMULZ-5400
           Sagem XG 760A
           Sagem XG 76NA
           Sandberg Wireless G54 USB
           Sitecom WL-113
           Sitecom WL-603
           SMC SMCWUSB-G
           Sweex wireless USB 54 Mbps
           Tekram/Siemens USB adapter
           Telegent TG54USB
           Trendnet TEW-424UB rev A
           Trendnet TEW-429UB
           TwinMOS G240
           US Robotics 5423
           X-Micro XWL-11GUZX
           Yakumo QuickWLAN USB
           Zonet ZEW2501
           ZyXEL AG-220
           ZyXEL AG-225H v2
           ZyXEL G-200 v2
           ZyXEL G-202
           ZyXEL G-220

FILES
     The adapter needs some firmware files, which are loaded on demand by the
     driver when a device is attached:

           /etc/firmware/zd1211
           /etc/firmware/zd1211b

EXAMPLES
     The following example scans for available networks:

           # ifconfig zyd0 scan

     The following hostname.if(5) example configures zyd0 to join network
     ``mynwid'', using WPA key ``mywpakey'', obtaining an IP address using
     DHCP:

           nwid mynwid
           wpakey mywpakey
           dhcp

DIAGNOSTICS
     zyd0: error N, could not read firmware ...  For some reason, the driver
     was unable to read the firmware image from the filesystem.  The file
     might be missing or corrupted.

     zyd0: could not load firmware (error=N)  An error occurred while attempt-
     ing to upload the firmware to the onboard microcontroller unit.

     zyd0: could not send command (error=...)  An attempt to send a command to
     the firmware failed.

     zyd0: sorry, radio ... is not supported yet  Support for the specified
     radio chip is not yet implemented in the driver.  The device will not
     attach.

     zyd0: device version mismatch: 0xXXXX (only >>= 43.30 supported)  Early
     revisions of the ZD1211 chipset are not supported by this driver.  The
     device will not attach.

     zyd0: device timeout  A frame dispatched to the hardware for transmission
     did not complete in time.  The driver will reset the hardware.  This
     should not happen.

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

AUTHORS
     The zyd driver was written by Florian Stoehr <ich@florian-stoehr.de>,
     Damien Bergamini <damien.bergamini@free.fr>, and Jonathan Gray
     <jsg@openbsd.org>.

CAVEATS
     The zyd driver does not support a lot of the functionality available in
     the hardware.  More work is required to properly support the IBSS and
     power management features.

BSD                              May 25, 2017                              BSD