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The term request refers to both the authentication/accounting request packet from a NAS to a RADIUS server and the response packet that the server sends back to the NAS.
Each request contains the following fields:
The code field identifies the type of the request.
The number in the range 0–255 used to match the request with the reply.
The length of the request packet.
The 16-byte hash value used to authenticate the packet.
The list of attribute-value pairs carrying actual information about the request.