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Identifier field (1 octet): Identifier for the request and answer packets.
Length field (2 octets): The length of the overall RADIUS packet, including Code, Identifier, Length,
Authenticator and Attributes
Authenticator field (16 octets): used for validation of the packets received from the RADIUS server. Or it can
be used to carry encrypted passwords. This field falls into two kinds: the Request Authenticator and the
Response Authenticator.
Attribute field: used to carry detailed information about AAA. An Attribute value is formed by Type, Length, and
Value fields.
Type field (1 octet), the type of the attribute value, which is shown as below:
(reserved for accounting)
Length field (1 octet), the length in octets of the attribute including Type, Length and Value fields.
Value field, value of the attribute whose content and format is determined by the type and length of the
attribute.
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