ZYD(4) MidnightBSD Kernel Interfaces Manual ZYD(4)


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


To compile this driver into the kernel, place the following lines in your kernel configuration file:

device ehci
device uhci
device ohci
device usb
device zyd
device wlan
device wlan_amrr

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):



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 associating 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.

zyd supports software 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.


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

3COM 3CRUSB10075
Airlink+ AWLL3025
Airlink 101 AWLL3026
AOpen 802.11g WL54
Asus A9T integrated wirless
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
Philips SNU5600
Planet WL-U356
Planex GW-US54GZ
Planex GW-US54GZL
Planex GW-US54Mini
Safecom SWMULZ-5400
Sagem XG 760A
Sagem XG 76NA
Sandberg Wireless G54 USB
Sitecom WL-113
Sweex wireless USB 54 Mbps
Tekram/Siemens USB adapter
Telegent TG54USB
Trendnet TEW-424UB
Trendnet TEW-429UB
TwinMOS G240
Unicorn WL-54G
US Robotics 5423
X-Micro XWL-11GUZX
Yakumo QuickWLAN USB
Zonet ZEW2501


The following examples configures zyd0 to join whatever network is available on boot, using WEP key ‘‘0x1deadbeef1’’, channel 11:

inet netmask wepkey 0x1deadbeef1 channel 11

Configure zyd0 for WEP, using hex key ‘‘0x1deadbeef1’’:

# ifconfig zyd0 wepkey 0x1deadbeef1

Join an existing BSS network, ‘‘my_net’’:

# ifconfig zyd0 netmask 0xffffff00 ssid my_net


zyd%d: could not load firmware (error=%d)  An error occurred while attempting to upload the firmware to the onboard microcontroller unit.

zyd%d: could not send command (error=%s)  An attempt to send a command to the firmware failed.

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

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

zyd%d: 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.


arp(4), intro(4), netintro(4), usb(4), wlan(4), wlan_amrr(4), ifconfig(8)


The zyd driver was written by Florian Stoehr 〈ich@florian-stoehr.de〉, Damien Bergamini 〈damien@openbsd.org〉, and Jonathan Gray 〈jsg@openbsd.org〉.


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.

MidnightBSD 0.3 September 6, 2007 MidnightBSD 0.3