WPA IE format

Paresh Sawant paresh.sawant at gmail.com
Wed Jul 16 00:46:48 EDT 2008

I think issue out here is there is no "IEEE documented" way to propagate WPA
(or TSN) IE in air.

I could see that wpa_supplicant code identifying the IE using ID # 0xdd and
OUI being 0x00 0x50 0xF2, also wireshark/ethereal show the same.

But is this a right way to go for it? Suppose an AP manufacturer goes for
this in some proprietary way having some other ID and OUI, then code would
fail to function against the AP.

I feel there need to be a standard way to do this, which I fail to find

- Paresh

On Tue, Jul 15, 2008 at 8:45 PM, Chuck Tuffli <CTuffli at dspg.com> wrote:

>  I believe the WPA IE is only published in a WiFi Alliance specification,
> but you can indirectly get information about its format from looking at
> wpa_supplicant's source or firing up Wireshark and letting the dissectors
> show you the fields. If your only goal is identification, WPA is a vendor
> specific IE (decimal 221) and use an OUI of 0x00 0x50 0xF2. Compared this to
> the RSN IE which has its own IE (decimal 48).
> ---chuck
> -----Original Message-----
> From: hostap-bounces at lists.shmoo.com on behalf of Paresh Sawant
> Sent: Mon 7/14/2008 11:05 PM
> To: hostap
> Subject: WPA IE format
> Hi,
> I don't see format for WPA(TSN) information element in the IEEE
> 802.11i-2004
> draft, though they have mentioned details for WPA2(RSN) information
> element.
> Is there any documented way on identifying if the AP is WPA or WPA2
> compliant, on the basis beacon frame parse results?
> Thanks
> - Paresh
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