The Wireless LAN Controller implementation

Jouni Malinen j
Sun May 2 00:25:44 PDT 2010

On Mon, Apr 19, 2010 at 02:31:49PM +0900, Masashi Honma wrote:

> I'm planning to implement Wireless LAN Controller (WLC). The WLC is
> Cisco hardware which exists between AP and RADIUS server. The figure
> is "STA --- AP --- WLC --- RADIUS server". The WLC receives EAPOL
> frame from AP and process it as authenticator. The AP is just like
> an antenna. So previous figure will be drawn as
> "supplicant --- antenna --- authenticator --- authentication server".
> The AP and WLC communicate with UDP.

Is this only EAPOL or are some IEEE 802.11 management frames handled at
the WLC, too?

> I will implement WLC as some patches to hostapd/wpa_supplicant. As
> first step, I will separate authenticator as another process and
> communicate with UNIX domain socket. How do you think ?

Depending on the exact functionality split, the easiest place to
separate things could be at the driver wrapper interface. Though, if the
driver uses hostapd for processing management frames, you would need to
build another component with just that code in and then connection to
the other part over the driver wrapper interface.

Jouni Malinen                                            PGP id EFC895FA

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