Radius Packet structure


Radius Packet structure
The RADIUS packet data format is shown to the right. The fields are transmitted from left to right, starting with the code, the identifier, the length, the authenticator and the attributes.

Access-Request – 1
Access-Accept  – 2
Access-Reject  – 3
Accounting-Request – 4
Accounting-Response – 5
Access-Challenge – 11
Status-Server – 12
Status-Client – 13
Reserved – 255

The Length field indicates the length of the entire RADIUS packet including the Code, Identifier, Length, Authenticator and optional Attribute fields.The Authenticator is used to authenticate the reply from the RADIUS server, and is used in encrypting passwords; its length is 16 bytes.

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