In enterprise wireless environments, access point roaming/hopping is very common. There exists a couple protocols/methods for making this seamless. That is, to make re-authentication when hopping to the next AP on an SSID smooth.
One is called Opportunistic Key Caching or sometimes called Proactive Key Caching, abbreviated OKC or PKC.
Windows and various Linux OSes support this protocol.
Apple OSX supports a similar thing called Pairwise Master Key ID Validation (PMKID Validation). From the Cisco link, we see that OKC is preferable to PMKID Caching when seamless AP hopping is the number 1 goal.
- Does current OSX support the OKC/PKC protocol/method? How about current iOS? As of 2011, according to Aruba, Apple does not support OKC/PKC.
- Is PMKID Caching the same as PMKID Validation?