There are several mini pci cards availiable (ebay is you best friend) either
new -old stock or pulls from upgrades etc.
Basicaly there are major types of cards, based on the chipset they are using
with varying linux support

1) Prism2 based cards
IMHO They are the best choice for 802.11b mainly due to functionality and
linux driver stability support.
The driver (hostap) supports all 3 modes ap,client and ad-hock, wep, power
control (through a patch) and recently WPA
I have been using Prism2/hostap for sometime now for long range (1 to 4km)
links with great success and little troubles
The bad thing is that Prism2 cards are no longer produced (or are about to
stop beeing produced) and most companies switch to other alternatives
The new Prism 3 cards are a different "beast", stay away if you can

2) Orinoco/Agere cards
VERY good radio, but unfortunately no support for AP mode (or to be more
exact very limited support, requires a a different driver,need to flash the
card with new firmware, not sure if it's supported anymore). Some of the
Agere cards, need a patch for the driver to work
Easy to find on Ebay (<20$) If you are looking for a client only solution
(no ap) it's a good option

3) Intel based cards (802.11 b/g)
The linux driver is under development, part is binary only (the HAL)
Intel was one for the first to use a "soft MAC controller" and this is a
reason why part of the driver is binary (i.e part of the firmware is handled
by the pc directly, similar to winmodems)I would not recomend them (for the
time) for production work, as driver has several bugs

4) Atheros based cards (802.11 a/b/g)
Also "soft mac", part of the driver (madwifi) is binary but at a much better
shape than intel's
Also supports AP mode (ad hock is broken) and a very good alternative to
hostap
The only availiabe solution for a/g AP's in linux

5) linksys WRT54G/ broadcom
Well it's a low cost alternative to a pc based AP but the broadcom radio
part is not that good (in terms of sensitivity)
Other than that looks like a good little (and cheap ;-) unit to use
Recently got about 100 units to be deployed for our community network
(Athens Wireless Metropolitan Network) for about 90Euro/pc

I am working on updating the wifi support for Bering (got the new hostap
drives compiled, working on the madwifi, intel next if time permits) and
possible adding some documentation also. I will post them as soon as i am
done as the wireless tools need also updating


Stelios





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