---
name: "if_zyd"
section: "4freebsd"
platform: "linux"
package: "freebsd-manpages"
version: "12.2-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/if_zyd/4freebsd"
---

# if\_zyd(4freebsd)

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

## NAME

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

## SYNOPSIS

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)](/loader.conf/5.md):

```
if_zyd_load="YES"
```

## DESCRIPTION

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

**zyd** supports **station** and **monitor** mode operation. Only one virtual interface may be configured at any time. For more information on configuring this device, see [ifconfig(8)](/ifconfig/8.md).

## 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

  - MyTek MWU-201 USB adapter

  - 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

  - SMC SMCWUSB-G

  - Sweex wireless USB 54 Mbps

  - Tekram/Siemens USB adapter

  - Telegent TG54USB

  - Trendnet TEW-424UB rev A

  - Trendnet TEW-429UB

  - TwinMOS G240

  - Unicorn WL-54G

  - US Robotics 5423

  - X-Micro XWL-11GUZX

  - Yakumo QuickWLAN USB

  - Zonet ZEW2501

  - ZyXEL ZyAIR G-202

  - ZyXEL ZyAIR G-220

  ## EXAMPLES

The following example configures zyd0 to join any BSS network using WEP key “0x1deadbeef1”, channel 11:

```
ifconfig wlan create wlandev zyd0 channel 11 \
    wepmode on wepkey 0x1deadbeef1 weptxkey 1 \
    inet 192.168.1.1 netmask 255.255.255.0
```

Join an existing BSS network, “my\_net”:

```
ifconfig wlan create wlandev zyd0 192.168.0.2 \
    netmask 0xffffff00 ssid my_net
```

## DIAGNOSTICS

- 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.

## SEE ALSO

[intro(4)](/intro/4.md), [netintro(4)](/netintro/4.md), [usb(4)](/usb/4.md), [wlan(4)](/wlan/4.md), [wlan\_amrr(4)](/wlan_amrr/4.md), [wlan\_ccmp(4)](/wlan_ccmp/4.md), [wlan\_tkip(4)](/wlan_tkip/4.md), [wlan\_wep(4)](/wlan_wep/4.md), [ifconfig(8)](/ifconfig/8.md), [wpa\_supplicant(8)](/wpa_supplicant/8.md)

## AUTHORS

The original **zyd** driver was written by Florian Stoehr ⟨*ich@florian-stoehr.de*⟩, Damien Bergamini ⟨*damien@openbsd.org*⟩, 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.