Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 11-05-2007 Installation Manual page 549

• Texas Instruments ACX100, ACX111
• ZyDAS zd1201
A number of older cards that are rarely used and no longer available are also supported.
An extensive list of WLAN cards and the chips they use is available at the Web site of
AbsoluteValue Systems at
_adapters.html.gz. Find an overview of the various WLAN chips at
wiki.uni-konstanz.de/wiki/bin/view/Wireless/ListeChipsatz.
Some cards need a firmware image that must be loaded into the card when the driver
is initialized. This is the case with Intersil PrismGT, Atmel, and TI ACX100 and
ACX111. The firmware can easily be installed with the YaST Online Update. The
firmware for Intel PRO/Wireless cards ships with SUSE Linux Enterprise and is auto-
matically installed by YaST as soon as a card of this type is detected. More information
about this subject is available in the installed system in /usr/share/doc/
packages/wireless-tools/README.firmware.
29.1.2 Function
In wireless networking, various techniques and configurations are used to ensure fast,
high-quality, and secure connections. Different operating types suit different setups. It
can be difficult to choose the right authentication method. The available encryption
methods have different advantages and pitfalls.
Operating Mode
Basically, wireless networks can be classified as managed networks and ad-hoc networks.
Managed networks have a managing element: the access point. In this mode (also re-
ferred to as infrastructure mode), all connections of the WLAN stations in the network
run over the access point, which may also serve as a connection to an ethernet. Ad-hoc
networks do not have an access point. The stations communicate directly with each
other. The transmission range and number of participating stations are greatly limited
in ad-hoc networks. Therefore, an access point is usually more efficient. It is even
possible to use a WLAN card as an access point. Most cards support this functionality.
Because a wireless network is much easier to intercept and compromise than a wired
network, the various standards include authentication and encryption methods. In the
original version of the IEEE 802.11 standard, these are described under the term WEP.
http://www.linux-wlan.org/docs/wlan
http://
Wireless Communication 531