Diameter is an authentication protocol that has the capability of authenticating
many different types of devices over different types of connections. RADIUS is
restricted to working only over PPP and SLIP connections and can authenticate
only computers and laptops that usemodems and regular authentication protocols,
as in PAP, CHAP, and EAP. Today, companies have many different types of
wireless devices that do not use these protocols and mechanisms, thus these
companies cannot authenticate them using the RADIUS protocol.
Companies that need this extra flexibility would look at implementing
Diameter instead of RADIUS or TACACS+.
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