Radius Packet Format - HP 1920 Series User Manual

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RADIUS packet format

RADIUS uses UDP to transmit messages. To ensure smooth message exchange between the RADIUS
server and the client, RADIUS uses a timer management mechanism, a retransmission mechanism, and
a backup server mechanism.
Figure 348 RADIUS packet format
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The following describes the fields of a RADIUS packet:
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The host requests the RADIUS client to tear down the connection and the RADIUS client sends a
stop-accounting request (Accounting-Request) to the RADIUS server.
The RADIUS server returns an acknowledgement (Accounting-Response) and stops accounting for
the user.
Figure 348
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Code Identifier
The Code field (1 byte long) indicates the type of the RADIUS packet.
Table 112 Main values of the Code field
Code Packet type
1 Access-Request
2 Access-Accept
3 Access-Reject
4 Accounting-Request
5 Accounting-Response
The Identifier field (1 byte long) is used to match request packets and response packets and to detect
duplicate request packets. Request and response packets of the same type have the same identifier.
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Authenticator
Attributes
Description
From the client to the server. A packet of this type carries user
information for the server to authenticate the user. It must contain the
User-Name attribute and can optionally contain the attributes of
NAS-IP-Address, User-Password, and NAS-Port.
From the server to the client. If all attribute values carried in the
Access-Request are acceptable, the authentication succeeds, and the
server sends an Access-Accept response.
From the server to the client. If any attribute value carried in the
Access-Request is unacceptable, the authentication fails, and the
server sends an Access-Reject response.
From the client to the server. A packet of this type carries user
information for the server to start or stop accounting for the user. The
Acct-Status-Type attribute in the packet indicates whether to start or
stop accounting.
From the server to the client. The server sends a packet of this type to
notify the client that it has received the Accounting-Request and has
successfully recorded the accounting information.
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