3Com Switch 4200G Configuration Guide

Overview 171
2 The Identifier field (one byte) identifies the request and response packets. It is subject
to the Attribute field and varies with the received valid responses, but keeps
unchanged during retransmission.
3 The Length field (two bytes) specifies the total length of the packet (including the
Code, Identifier, Length, Authenticator and Attribute fields). The bytes beyond the
length will be regarded as padding characters and are ignored upon receiving the
packet. If the received packet is shorter than the value of this field, it will be
discarded.
4 The Authenticator field (16 bytes) is used to verify the packet returned from the
RADIUS server; it is also used in the password hiding algorithm. There are two kinds
of authenticators: Request and Response.
5 The Attribute field contains special authentication, authorization, and accounting
information to provide the configuration details of a request or response packet. This
field is represented by a field triplet (Type, Length and Value):
■ The Type field (one byte) specifies the type of the attribute. Its value ranges from 1
to 255. Table 133 lists the attributes that are commonly used in RADIUS
authentication and authorization.
■ The Length field (one byte) specifies the total length of the Attribute field in bytes
(including the Type, Length and Value fields).
■ The Value field (up to 253 bytes) contains the information about the attribute. Its
content and format are determined by the Type and Length fields.
4 Accounting-Request Direction: client->server.
The client transmits this packet to the server to request the server
to start or end the accounting (whether to start or to end the
accounting is determined by the Acct-Status-Type attribute in the
packet).
This packet carries almost the same attributes as those carried in
the Access-Request packet.
5 Accounting-Respon
se
Direction: server->client.
The server transmits this packet to the client to notify the client
that it has received the Accounting-Request packet and has
correctly recorded the accounting information.
Table 132 Description on major values of the Code field (Continued)
Code Packet type Packet description
Table 133 RADIUS attributes
Value of the
Type field
Attribute type
Value of the
Type field
Attribute type
1 User-Name 23 Framed-IPX-Network
2 User-Password 24 State
3 CHAP-Password 25 Class
4 NAS-IP-Address 26 Vendor-Specific
5 NAS-Port 27 Session-Timeout
6 Service-Type 28 Idle-Timeout
7 Framed-Protocol 29 Termination-Action
8 Framed-IP-Address 30 Called-Station-Id
9 Framed-IP-Netmask 31 Calling-Station-Id
10 Framed-Routing 32 NAS-Identifier
11 Filter-ID 33 Proxy-State
12 Framed-MTU 34 Login-LAT-Service