A lot of Simpad users have Siemens I-Gate PCMCIA WLAN cards. Those cards support only WEP encryption which is no longer secure. To setup WPA the wpa_supplicant is needed which is today included in the Angstrom distribution.
Example setup:
File /etc/network/interfaces
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant.conf
wpa-driver hostap
File /etc/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
ap_scan=1
network={
ssid="your ssid"
key_mgmt=WPA-PSK
proto=WPA2
pairwise=CCMP
group=CCMP
scan_ssid=1
psk="secret password"
}
An interesting observation is that the Siemens I-Gate devices does only make propoer WPA/WPA2 connections on channels 10 and 11. All other channels are detected during scanning, but fail during association.