thanks for the replies chaps.
i am trying to take advantage of RADIUS load balancing to multiple Publishers.
I have AP's terminating on diferent local controllers and guests who sign up to a Publisher
through one AP and may roam to another AP which is on a different local controller.
Subsequebnt to guest account creation I want use MAC AUTH to the original Publisher the guest signed up with so hence i wanted to
try and centralize the RADIUS activity.