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wireless PCMCIA card (Microsoft MN520)

Hello list. I just got a Microsoft wireless adapter MN520
with the corresponding base (I don't remember the model). I am trying to
set it up with encryption (actually, I didn't try without it).
I compiled the linux-wlan package from http://www.linux-wlan.com
(version 0.2.1-pre9).
I am not sure if I need the wireless_tools package (I compiled version
My linux kernel is 2.4.22 which I recompiled with PCMCIA support.

I understand that the parameters are suposed to
be set in /etc/network/interfaces in Debian, here is mine

# /etc/network/interfaces 
auto wlan0
iface wlan0 inet dhcp

wireless_channel 6
wireless_enc on
wireless_mode Managed
wireless_essid sicilia
wireless_key 5c158829f44a7f02dda1fab1cb
# or is it: wireless_key 5c:15:88:29:f4:4a:7f:02:dd:a1:fa:b1:cb  ??

and the output of the ifup command:

root@localhost:~# ifup wlan0
Continuing at if-pre-up
++ LASTLOCN=if-pre-up
++ export LASTLOCN
++ LOCATION=if-pre-up
++ export LOCATION
Error for wireless request "Set Frequency" (8B04) :
    SET failed on device wlan0 ; Function not implemented.
run-parts: /etc/network/if-pre-up.d/wireless-tools exited with return
code 251
Internet Software Consortium DHCP Client 2.0pl5
Copyright 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.
All rights reserved.
Please contribute if you find this software useful.
For info, please visit http://www.isc.org/dhcp-contrib.html
Listening on LPF/wlan0/00:50:f2:cf:0d:23
Sending on   LPF/wlan0/00:50:f2:cf:0d:23
Sending on   Socket/fallback/fallback-net
DHCPDISCOVER on wlan0 to port 67 interval 3
DHCPDISCOVER on wlan0 to port 67 interval 4

what worries me is the error "SET failed on device wlan0 ; Function not 
implemented." I would like to know if it is a configuration problem or
is something more complicated than that. Do any of you guys have
experience with this kind of card?

Any comments/suggestions are welcome.

Thanks a lot!


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