During the authentication process the participants use the following protocol elements:
REQUEST: When a new connection attempt arrives to the NAS, it sends a message towards the RADIUS server requesting the authentication of the user; or it sends an accounting related message.
RESPONSE: The RADIUS server attempts to authenticate the user when an authentication REQUEST is received. The server returns the result of the process to the NAS in a RESPONSE message.
ATTRIBUTE: Both the REQUEST and RESPONSE packets contain a set of structured attribute-value pairs containing information like username, password or the type of service requested by the user. Attributes are identified by a number ranging from 0 to 255. Each attribute has an associated type specified in the RADIUS RFCs which define the range of valid values.
Note There are also some vendor-specific RADIUS dictionaries, where certain attributes are used for internal purposes. Obviously, these are not discussed in the RFCs.
Published on June 04, 2020
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