radius and kerberos

Radius and Kerberos are two different things and are often mistaken to
be rivals.
http://groups.google.com/group/comp.protocols.kerberos/browse_thread/thread/ac3c6e606c48a72a/c575caa3d41e0fad%23c575caa3d41e0fad?sa=X&oi=groupsr&start=0&num=3