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I was thinking that by using WPA-PSK, client roaming producing a DHCP request when changing AP will not be sent by the controller to the DHCP server, which appears to be false.
Wanting to know : does CCKM (with leap) could stop this behavior, eliminating that DHCP request ? I know Radius request will not be send but what about the DHCP request ?
You shouldn't get a dhcp request when roaming from one ap to another unless your force that via the client or wlc configuration. Maybe I'm not understanding the question correctly....
Agreed. You should not be getting a dhcp request when roaming. THe only time I've seen that happen is when the dhcp server does not support dhcp requests by proxy. In that case go to the cli and
config dhcp proxy disable
That will force the controller to show the client information in the dhcp request and not the virtual interface of the controller.
I don't think this is your problem however.