HP FlexFabric 5700 Series Security Configuration Manual page 16

9. The RADIUS server returns an acknowledgment (Accounting-Response) and stops accounting for
the user.
10. The RADIUS client notifies the user of the termination.
RADIUS packet format
RADIUS uses UDP to transmit packets. The protocol also uses a series of mechanisms to ensure smooth
packet exchange between the RADIUS server and the client. These mechanisms include the timer
mechanism, the retransmission mechanism, and the backup server mechanism.
Figure 4 RADIUS packet format
Descriptions of the fields are as follows:
The Code field (1 byte long) indicates the type of the RADIUS packet.
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and their meanings.
Table 1 Main values of the Code field
Code Packet type
1 Access-Request
2 Access-Accept
3 Access-Reject
4 Accounting-Request
Accounting-Respons
5
e
The Identifier field (1 byte long) is used to match response packets with request packets and to detect
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duplicate request packets. The request and response packets of the same exchange process for the
same purpose (such as authentication or accounting) have the same identifier.
Description
From the client to the server. A packet of this type includes 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 included 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 included 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 includes 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.
4
Table 1 gives the main values