Hi,

> Cisco 2950 switch has an "auth fail" vlan option. If port authentication 
> fails, the port is marked authorized and put in the configured auth-fail vlan 
> as opposed to the default vlan or remaining in an unauthorized state. For 
> Windows XP SP2, if authentication fails, the user is notified - however, 
> network communications across that vlan works fine.
>   

So, what means "port authentication fails"? An Access-Reject? Well what
you were trying to do was send an Access-Accept no matter what, which is
for an authenticator a reason to count it as success, and will
subsequently not put a user in a auth fail VLAN.

> Additionally, consider this: a packet capture reveals that, even after 
> authentication has failed, Windows XP SP2 will send out DHCP requests.  
> Evidently the supplicant is somehow decoupled from the other processes 
> involved in bringing up a network interface.
>   

SP3? Vista? Nokia N95? iPhone 3G? Make a list of stuff to test...

Stefan

-- 
Stefan WINTER
Ingenieur de Recherche
Fondation RESTENA - Réseau Téléinformatique de l'Education Nationale et de la 
Recherche
6, rue Richard Coudenhove-Kalergi
L-1359 Luxembourg

Tel: +352 424409 1
Fax: +352 422473

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