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This driver supports the zd1211 and the newer zd1211b chipsets by Zydas.

The older zd1211 chipset only partially supports injection. Any injection which requires the device to receive a packet does not work correctly. So the fake authentication, chopchop, and fragmentation attacks plus injection testing do not work. Other basic functions such as monitor mode and the remaining attacks work.

The new zd1211b chipset fully supports all functions.

The zd1211rw driver has been incorporated into the latest kernels. So you will have to patch the kernel source to obtain injection support. This is described below in detail.

The following links may be helpful to you to learn more about the driver and which devices are supported by it:

Patching zd1211rw

This section will describe how to patch your driver for injection. There is quite a bit of variation between distributions so this describe the general steps you must take. You will have to tweak the instructions for your specific distribution and kernel version. It assumes a reasonable level of unix knowledge and experience. If you don't have this, ask a friend to help you out. If you can't follow these instructions then you should not be messing with your kernel. Don't post to the Forum asking for detailed instructions.

You will need to have your kernel headers and full source already installed on your system. See Installing Fedora kernel headers and sources below for how to do this on Fedora.

Copy contents of /usr/src/linux/net/ieee80211 to a safe place. This is so you can recover if things go bad or if you want to apply a new version of the patch.

Copy contents of /usr/src/linux/drivers/net/wireless/zd1211rw to a safe place. This is so you can recover if things go bad or if you want to apply a new version of the patch.

Download and expand the latest version of the aircrack-ng suite to obtain the patches or download the from here. Typically, you will need the svn version to have best patches. Please note that the patch names might change so you may have to adjust the version numbers in the next few steps.

Copy zd1211rw_inject_2.6.22.patch to /usr/src/linux/

cd /usr/src/linux/

NOTE: In the following lines, verbose and dry-run have a double dash in front of them.

patch -Np1  --verbose --dry-run -i zd1211rw_inject_2.6.22.patch 

If it was OK:

patch -Np1  --verbose  -i zd1211rw_inject_2.6.22.patch 

Copy ieee80211_inject.patch to /usr/scr/linux

patch -Np1  --verbose --dry-run -i ieee80211_inject.patch

If it was OK:

patch -Np1  --verbose  -i ieee80211_inject.patch

NOTE: In the following lines, change “2.6.20-1.2944.fc6” to match your particular system.

cd /usr/src/linux/drivers/net/wireless/zd1211rw
make -C /lib/modules/2.6.20-1.2944.fc6/build/ M=`pwd` modules
cd /usr/src/linux/net/ieee80211
make -C /lib/modules/2.6.20-1.2944.fc6/build/ M=`pwd` modules

Now copy the new modules to the /lib/modules tree to be used.

cp /usr/src/linux/drivers/net/wireless/zd1211rw/zd1211rw.ko /lib/modules/2.6.20-1.2944.fc6/kernel/drivers/net/wireless/zd1211rw/zd1211rw.ko
cp /usr/src/linux/net/ieee80211/*.ko /lib/modules/2.6.20-1.2944.fc6/kernel/net/ieee80211/
cp /usr/src/linux/net/ieee80211/softmac/*.ko /lib/modules/2.6.20-1.2944.fc6/kernel/net/ieee80211/softmac/

And finally, rebuild the module dependencies.

 depmod -ae

At this point, the simplest method to bring up the new modules live is to reboot your system.

If you have problems compiling zd1211rw, you can try:

 CONFIG_ZD1211RW=m make -C /lib/modules/`uname -r`/build M=`pwd` clean
 CONFIG_ZD1211RW=m make -C /lib/modules/`uname -r`/build M=`pwd` modules

Installing Fedora kernel headers and source

These instructions are specific to Fedora. Change 2.6.20-1.2944.fc6 to the particular kernel version you have installed. uname -r can help you determine what is currently installed.

You need these packages already installed:


Running the command rpm -qa | grep kernel will show which kernel packages are installed.

If the headers and development packages are not already installed then obtain them from your favourite repository then:

rpm -ivh kernel-headers-2.6.20-1.2944.fc6.i386.rpm
rpm -ivh kernel-devel-2.6.20-1.2944.fc6.i686.rpm (obtain i586 or i686 depending on your architecture)

Alternatively, use yum -y install kernel-headers“ and yum -y install kernel-devel.

Now download and install the full kernel sources if they are not already on your system (This assumes you have downloaded this RPM from your favourite repository).

rpm -ivh kernel-2.6.20-1.2944.fc6.src.rpm 

Change to the following directory:

cd /usr/src/redhat/SPECS

Change ”–target=i586“ to the architecture of your system in the next line.

rpmbuild -bp --target=i586 kernel-2.6.spec

NOTE: Change references to versions to your specific version in the next few lines.

/bin/cp -a /usr/src/redhat/BUILD/kernel-2.6.20/linux-2.6.20.i586/*  /usr/src/kernels/2.6.20-1.2944.fc6-i586/
ln -s /usr/src/kernels/2.6.20-1.2944.fc6-i586 /usr/src/linux

Recompiling Kernel with Loadable Modules

Some kernels incorporate the functionality built into the kernel. If you want to change the zd1211rw and ieee802.11 to loadable modules, the following describes how to do this. The source of this note is this thread in the forum.

These are the settings for menuconfig using 2.6.20-gentoo-r7, changing from kernel built-in to loadable modules for the purposes of these patches. This will likely work as well on other distributions.

First, change the appropriate items in menuconfig:

 cd /usr/src/linux
 make menuconfig
 Networking ---->
 then set
 <M> Generic IEEE802.11 Networking Stack
 <M> Software MAC add-on to the IEEE 802.11 netowrking stack
 all other module capable IEEE 80211 items will have automatically set themselves to <M>
 Also check that:
 Device Drivers ----> Network device support ----> Wireless LAN (non-hamradio) ---->
 <M> ZyDAS ZD1211/ZD1211B USB-wireless support is also set to <M>
 Exit out and save the config

Now apply the zd1211 and ieee80211 inject patches and recompile/install the kernel and modules.

 Apply the zd1211 inject and ieee80211 inject patches as per patch instructions but only do the 4 patch -Np1  commands, in gentoo doing the make commands and copying all the files is unnecessary!!

After the patches are applied, you can now recompile the kernel and modules with the following commands:

 cd /usr/src
 make && make modules modules_install install

Wait for it to finish and then reboot your system.

Lastly, test your drivers and the injection patch.



Use “lsusb” to ensure your device is recognized. For example, “ID 157e:300d” below is a Trendnet TEW-429UB zd1211b unit. Sample lsusb output:

 Bus 003 Device 003: ID 157e:300d  
 Bus 003 Device 001: ID 0000:0000  
 Bus 001 Device 001: ID 0000:0000  
 Bus 002 Device 001: ID 0000:0000

If your device is not listed then you first need to determine why and correct it.

Use “dmesg” to ensure your device was properly loaded. You may have do “modprobe zd1211rw” to cause the kernel module to be loaded. Below is an example of the zd1211rw module being successfully loaded. Sample dmesg output:

 ieee80211_crypt: registered algorithm 'NULL'
 ieee80211: 802.11 data/management/control stack, git-1.1.13
 ieee80211: Copyright (C) 2004-2005 Intel Corporation <>
 usb 3-1: reset high speed USB device using ehci_hcd and address 3
 usb 3-1: firmware version 0x4810 and device bootcode version 0x4802 differ
 zd1211rw 3-1:1.0: firmware version 4725
 zd1211rw 3-1:1.0: zd1211b chip 157e:300d v4802 high 00-14-d1 AL2230_RF pa0 -----
 zd1211rw 3-1:1.0: eth1
 usbcore: registered new interface driver zd1211rw

Depending on the error messages in dmesg, take the appropriate action.

Use “lsmod” and ensure the zd1211rw module is loaded. Below is a subset of the output from lsmod showing the zd1211rw in memory. Notice there are other dependencies. Sample lsmod output:

 Module                  Size  Used by
 zd1211rw               52740  0 
 ieee80211softmac       35265  1 zd1211rw
 ieee80211              35784  2 zd1211rw,ieee80211softmac
 ieee80211_crypt        10112  1 ieee80211

A common problem on new kernels is that the new mac80211 version of the driver gets loaded instead of the older legacy driver covered on this page. If that is the case, then you need to blacklist the modules by editing /etc/modprobe.d/blacklist and add the following then reboot:

 #zd1211rw wireless drivers
 blacklist zd1211rw
 blacklist zd1211rw_mac80211

Also ensure that the time stamp on zd1211.ko module matches the date and time you compiled it. Otherwise this may mean you are running the wrong version of the module.

Couldn't load firmware. Error number -2

If dmesg has an error similar to the following:

 usb 1-1: Could not load firmware file zd1211/zd1211b_ub. Error number -2
 zd1211rw 1-1:1.0: couldn't load firmware. Error number -2

This means you are missing the firmware for your device or it is located in the wrong location. The firmware is downloaded to the device each time it is initialized by the kernel module and is required for your device to operate. The typical location is /lib/firmware/zd1211. Please keep in mind that this may vary for your specific distribution. Try this location first, if that fails then seek out help from your distribution support group or review the source code of the zd1211rw module on your distribution.

On some distributions, the kernel version is included in the firmware path: /lib/firmware/<kernel version from uname -r>/zd1211. If this is the case then you may have to copy the firmware to the standard driver location or add a symbolic link. One way or another, the driver needs to be able to find the firmware.

You can obtain the firmware from:

  1. RPM for you distribution. For example under fedora it is similar to “zd1211-firmware-x.x-x.fcx”
zd1211rw.1188843096.txt.gz · Last modified: 2007/09/03 20:11 by darkaudax