hostapd roaming recommendations: 802.11r vs 802.11f iapp vs 802.11i RSN pre-auth

[Carlos Alberto Lopez Perez]

Hello,

I'm trying to create a wireless network consisting of several access points
so clients can roam seamlessly between them according to the following scheme:


                  +---------+
                  |         |
                  | Internet|
                  |         |
                  +----+----+
		       |
		       |2
                   +---+---+
                  1| Eth.  |3
            +------+ bridge+------+
	    |      |       |      |
	    |      +-------+      |
	    | eth0                | eth0
	+---+---+             +---+---+
        |       |             |       |
        |  AP1  |             |  AP2  |
        |       |             |       |
	+---+---+             +---+---+
	    | wlan0               | wlan0
	    o                     o
                o
                |
            +---+---+
            |       |
            |  STA  | =>
            | (Rec) |
            +-------+


All access points have an atheros card (ath5k) and run hostapd with
WPA-TKIP. As I have seen in the hostapd configuration there are three ways
to make roaming:

1) IEEE 802.11i RSN pre-authentication
2) IEEE 802.11f IAPP
3) 802.11r


Are these standards mutually compatible? That is, Is it a good idea to
activate all three at once?

If not which of these is desirable and what advantages has over the others?

I will thank you any comment, experience or suggested reading that you can
share with me about this.


Cheers!

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