When I set AP like WEP/OPEN or WEP/SHARED , How Can I get AuthMode from IE Codes or anyway else?

Dan Williams dcbw at redhat.com
Tue Dec 1 04:06:28 EST 2009


On Tue, 2009-12-01 at 16:56 +0800, Anson_Luo at cn.alphanetworks.com wrote:
> 
> Dear Dan: 
> 
>         I got it, Thanks very much!  I am a novice in wireless
> networks. I learn it since last week.Thanks for your help. 

No problem.  The simple answer is "WEP is horrible".  Not just from a
security standpoint.

Dan


> 
> 
> 
> 
> 
> Dan Williams
> <dcbw at redhat.com> 
> 
> 2009-12-01 15:59 
> 
> 
>         
>         To:
>  Anson_Luo at cn.alphanetworks.com 
>         cc:
>  hostap at lists.shmoo.com 
>         Subject:
>  Re: When I set AP like
> WEP/OPEN or
> WEP/SHARED , How Can I
> get AuthMode from IE
> Codes or anyway else?
> 
> 
> 
> On Tue, 2009-12-01 at 09:23 +0800, Anson_Luo at cn.alphanetworks.com
> wrote:
> > 
> > ALL here: 
> >         I have a question that let me puzzle: 
> > When I set AP like WEP/OPEN or WEP/SHARED ,How Can I get AuthMode
> from
> > IE Codes or anyway else? 
> 
> You cannot.  Open/Shared is simply not present in the AP's beacon.  It
> is a deficiency of WEP, which WPA fixed by only allowing open
> authentication for WPA connections.  There is simply no way to tell
> whether an AP is using shared auth or open system auth because a WEP
> AP
> never broadcasts that information.
> 
> Either the user has to specify the WEP authentication mode explicitly,
> or the supplicant/driver must first try Shared Key first, and then
> Open
> System when/if the AP reports that SK is not available (using 802.11
> status code 13, "Requested authentication algorithm not supported").
> 
> Dan
> 
> 
> 



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