Cisco Aironet 1200 series AP
Dell Laptops (In built Wireless NIC, + Cisco PCMCIA)
Security: WPA -
Auth: PEAP w/ EAP MSCHAP-V2 (802.1x to radius), PKI
Encryp: TKIP, RC4
I'm trying to set up a wireless network, and am encountering a strange problem with TKIP. Every 20 minutes (or so, the timings appear random) the AP switches its security method to "Open" causing all clients associated with that particular AP, to drop the connection, and connect to a neighbouring AP. The AP's security method then comes back online, in a matter of seconds, and the connection then reverts back to the original AP, but in the meantime, connection to clients has been lost...
I have tried several different AP's, and am sure there is no RF interference causing the connection to drop out. All the firmware for client cards and AP’s is fully up to date. This issue occurs even with CISCO AP – CISCO CLIENT, so there doesn’t seem to be any vendor specific-ness involved.
When another encryption method is in use (WPA2).. the above does not occur. Unfortunately, WPA2 is not a viable option due to Microsoft’s unwillingness to allow group policy application!
So... If anyone can shed some light on why the above is happening, or could provide some technical information about TKIP which may explain as to why this is happening, it would be greatly appreciated.
I am not expecting a full answer, therefore I have not applied a large amount of points, to what I believe is a difficult question. If an answer does exceed my expectation (someone has a perfect answer) then I will award more points accordingly.
Thanks a lot in advance!