We know that OKC (Opportunistic Key caching) is proprietary and should be supported by client also.
Please anyone can advice me where I have to look at in re-association frame to check client’s capability for OKC ?
Anyone knows which clients support OKC ?
The PMKID is sent in the association or reassociation frame to request either PMK caching or OKC. If the AP does not support PMK caching or OKC, it will just process while disregarding the request.
Here is a good overview article of different fast roaming methods:
Here is our local whitepaper on the topic:
As to which clients support OKC it's best to just check the specs for the given adapters or integrated wifi support.