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I have been asked to get an 857 running WPA2, but have been struggling to find any references on how to do it - the best document I have seen on configuring the 857 seems to predate the availability of WPA2 http://www.cisco.com/en/US/docs/routers/access/1800/wireless/configuration/guide/awg.html
I'm curious about this myself. Last I used one of these, the cards didn't support WPA2. Unfortunately, this might still be the case, but I'd love to hear from someone that it isn't.
http://www.cisco.com/en/US/prod/collateral/routers/ps380/ps6195/product_data_sheet0900aecd8028a9a9.html says they do, what I am struggling with is the how!
dot11 ssid WPA2-test
authentication key-management wpa
wpa-psk ascii testPassphrase
encryption mode ciphers aes-ccm