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