Ethereal-users: Re: [Ethereal-users] determining AP auth mode (open system or shared key) based

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From: Motonori Shindo <mshindo@xxxxxxxxxxx>
Date: Fri, 11 Jun 2004 05:54:58 +0900 (JST)
From: David Wuertele <dave-gnus@xxxxxxxxx>
Subject: [Ethereal-users] determining AP auth mode (open system or shared key) based on probe response
Date: Wed, 09 Jun 2004 14:06:39 -0700

> I'm using kismet and ethereal to help write a wireless driver, and I'm
> trying to figure out how to discover the access point's authentication
> mode based on a probe response.
> 
> Can anyone who has a copy of the 802.11b standard tell me where in the
> probe response the supported authentication modes are indicated?

I don't think Authentication Algorithm (Open System/SharedKey)
information appears in Probe Response Frame. It only appears in
Authentication Frame. STA may try either algorithm it likes. If it is
not accepted by AP, then STA may try the other. You can download the
802.11 spec from the following URL:

  http://standards.ieee.org/getieee802/portfolio.html

Hope this helps.

Best Regards,