Can supplicant do VHT on 2.4Ghz?

Jouni Malinen j at
Fri Mar 4 10:17:07 PST 2016

On Mon, Feb 22, 2016 at 11:42:18AM -0800, Ben Greear wrote:
> I'm trying to get VHT to work on 2.4Ghz...
> It looks like 4.4 kernel with ath10k driver and recent hostapd
> enables VHT on 2.4Ghz.  But, supplicant isn't associating at
> VHT rates.

VHT is defined only for 5 GHz. It does not exist for 2.4 GHz. Sure,
there are vendor specific extensions to be able to use some (mainly,
256-QAM) parts of it. hostapd has support for using a vendor extension
for negotiating use of 256-QAM (vht_vendor=1) which works with ath10k.
wpa_supplicant has no code for such negotiation and based on where we
normally negotiate VHT on 5 GHz, this does not belong in wpa_supplicant
anyway. In other words, there would need to be some driver (or well,
mac80211 in this specific case) changes to add support for the vendor
specific negotiation.
Jouni Malinen                                            PGP id EFC895FA

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