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Nokia A032 Addendum
on the protocol specification. The protocol
specification uses name Network Access Server
(NAS) for the client of the Radius server. On our
WLAN radius security scheme, the AP is
equivalent to the NAS on the protocol
specification so the AP is a client of the Radius
server (in other words, the NAS functionality is
build into the AP).
The third component is the Radius server,
which takes care of deciding if the clients
should be granted access to the network.
Usually, there is a database attached to the
Radius server implementation, which holds the
list of the authorized clients. Radius server is a
stateless system that receives packets and
responds to them right away. If state
information is needed, it is included in the
response. When clients receive the state
information, this includes the state of its
response packet.
The fourth component is the proxy server. It
receives requests from the NAS and either
processes them by itself or sends them to
another Radius server. This makes it possible to
distribute the processing of Radius requests,
allowing load balancing and making the
security solution more fail safe.