Madwifi
MadWifi driver
MadWifi is short for Multiband Atheros Driver for Wireless Fidelity. In other words: it is a Linux kernel device driver for Atheros-based Wireless LAN devices. The driver works such that your WLAN card will appear as a normal network interface in the system. Additionally there is support for the Wireless Extensions API. This allows you to configure most aspects of the device using common wireless tools (ifconfig, iwconfig and friends).
MadWifi supports PCI, MiniPCI and Cardbus devices, USB devices are not yet supported.
Operational Modes
The following operational modes are supported:
sta
Station, a.k.a. infrastructure or managed. This device acting as typical WLAN client station. This is the default mode if not otherwise specified.
ap
Access Point, a.k.a. master. This device acts as the Access Point for other WLAN client stations.
adhoc
Ad-hoc. a.k.a. IBSS mode. This device is in a peer-to-peer(s) WLAN without the need for an Access Point.
ahdemo
Ad-hoc Demo. This is an older, non-802.11 compliant, proprietary ad-hoc mode.
monitor
Monitor. This device can be used to "sniff" raw 802.11 frames.
wds
Wireless Distribution System. This device can be used to create large wireless networks by linking several Access Points together.
Encryption
WEP
Wired Equivalent Privacy, with 40/64 bit and 104/128 bit keys; supported in modes: sta, ap, adhoc
WPA
WiFi Protected Access; supported in modes: sta (through wpa_supplicant), ap (through hostapd)
WPA2/IEEE 802.11i
WiFi Protected Access 2; supported in modes: sta (through wpa_supplicant), ap (through hostapd)
IEEE 802.1X
Port-based Network Access Control; supported in modes: ap
Multi-BSSID
MadWifi allows to run several virtual Access Points on a single card, by introducing the so called Virtual Access Points (VAP). VAPs sit on top of a base device (usually called wifi0), representing virtual WLAN devices that (despite their name) can be used in different other modes. That way a single WLAN card can connect to an Access Point while at the same time acting as Access Point for other stations. Other combinations of operational modes are possible as well.
To manipulate VAPs, MadWifi comes with a tool called wlanconfig which is used to create and destroy VAPS with various different modes.
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