> The assumption made here is that the authenticator is the AP. 
> I believe things would be much easier and still safe if one 
> authenticator would control a group of APs and not just be 
> one itself. This group of APs could be a subnet or a smaller 
> group, but at least within this group the handoff would be 
> much faster. The authenticator would act in the same way 
> except that it would do the job for a group of APs and not 
> for just one. If this would be done than all the questions 
> above would have their answers. What is your opinion?

This is how some of the switched wireless systems work.  However, if you
roam from an AP on one switch to an AP on another switch, you still have
the same issue.  It reduces the volume of traffic but doesn't make it
disappear altogether.

You can also reduce the amount of reauthentication traffic if your
supplicant, authenticator and authentication server all support Session
Resumption.  This works on the premise that at the point where the
Session-Timeout times out, if the supplicant and the authenticator both
know the master key, then there's no need to trouble the authentication
server.  Normally, there is a time and/or number of reauthentications
limit on this process before a complete reauthentication has to take
place.

Regards,

Guy

> 
> Andrea
> 
> >
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