====== DEPRECATED - iwl3945 ======

//Note: This page is about the iwl3945 driver. For the older ipw3945/ipwraw driver, see [[ipw3945]].//

====== Intel PRO/Wireless 3945ABG, mac80211 driver ======

Iwl3945 is the new driver for the Intel PRO/Wireless 3945ABG wireless chipset. It includes new features like:
  * Managed and monitor mode support in one driver
  * Enhanced injection support
  * Multiple interfaces on one device - use the aircrack suite on a monitor interface while remaining associated on a managed interface
  * Full radiotap support, for both incoming and outgoing packets
  * No more binary regulatory daemon needed, regulatory enforcement is done by the firmware

The driver is based on the [[mac80211]] stack, so the usual requirements apply (aircrack-ng 1.0-rc1, a recent version of libnl, a fairly new kernel, etc.)

===== Installing the driver =====

Starting with 2.6.24, the driver is included in the kernel. **Injection requires 2.6.25 or later.** The compat-wireless-old package must be installed and patched to get injection support on 2.6.25 and 2.6.26. For 2.6.27 and newer, no special patch is needed, follow the common instructions for [[mac80211]]. 

*UPDATE* Apparently the new version of compat-wireless should *not* be patched and should work out of the box.
more can be found here: http://forum.aircrack-ng.org/index.php?topic=2898.0

==== Installing and patching compat-wireless ====

  - Install your kernel headers and sources, as well as all packages required for building kernel modules.
  - Download compat-wireless from [[http://www.linuxwireless.org/en/users/Download#Wheretodownload|here]]. For 2.6.26 and older, use compat-wireless-old, for newer versions (currently 2.6.27-rcX), use compat-wireless-2.6.
  - Untar the archive to your home directory. This will create a dated directory ~/compat-wireless-DATE, where DATE is the build date of the package.
  - Download [[http://patches.aircrack-ng.org/mac80211.compat08082009.wl_frag+ack_v1.patch|the fragmentation patch]], and apply it to the compat-wireless package. This is needed to make attacks -5 and -7 work.
  - Cd to the compat-wireless directory, and run "make" to build the package.
  - Install the package with "make install", then load it with "make load".
  - If you get errors during "make load", reboot and all should work.

===== Using iwl3945 with aircrack-ng =====

Before using the card with aircrack-ng, you must create a monitor interface, using the command
<code>airmon-ng start wlan0</code>
where wlan0 is the interface name of the card. This will create a monitor interface called "mon0" (prefix changeable using the $MON_PREFIX environment variable, e.g. a $MON_PREFIX of "rtap" will result in an interface called "rtap0"). Next, run
<code>airodump-ng -c <channel>,<channel> mon0</code>
where <channel> is the channel the target AP is running on, while mon0 is the monitor interface you created in the first step. You must enter the channel twice, e.g. "-c 3,3", otherwise it will reset to channel 1. This is a bug in the driver, and a fix for it has been scheduled for inclusion into the kernel.
After this, use "mon0" as the interface name for all monitoring/injection tasks.

===== Useful links / info =====
  * Thread: [[http://forum.aircrack-ng.org/index.php?topic=2898|***iwlwifi drivers with injection***]]

===== Troubleshooting Tips =====

  * Chopchop and Fragmentation attacks do not work:  There is a report (see [[http://forum.aircrack-ng.org/index.php?topic=6143|this thread]]) which indicates kernel 2.6.30 causes them to fail.