Re: [Patch v9 10/16] AP: Support Extended Key ID

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On Mon, 2020-01-06 at 11:26 +0200, Jouni Malinen wrote:
> On Sat, Jan 04, 2020 at 11:10:09PM +0100, Alexander Wetzel wrote:
> > Support Extended Key ID in hostapd according to IEEE 802.11-2016.
> > 
> > Extended Key ID allows to rekey pairwise keys without the otherwise
> > unavoidable MPDU losses on a busy link. The standard is fully backward
> > compatible, allowing an AP to serve STAs with and without Extended Key
> > ID support in the same BSS.
> 
> The standard may claim to be fully backwards compatible, but that does
> not mean there would be guarantee of no regressions or interop issues if
> this were enabled.. I'd consider getting this in first with default
> being the functionality being disabled. Once there is some more trust in
> this actually working and not causing problems (e.g., an independent
> implementation to test against), the default could be changed in the
> future.

You'll never find out if you don't enable it though? :)

But are you thinking that clients might get confused by a new extended
capability bit getting set? That's something that happens all the time.
Or clients might erroneously set the extended capability bit for
extended PTK IDs?

johannes


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