3.
The Length field (2 byte long) indicates the length of the entire packet, including the Code,
Identifier, Length, Authenticator, and Attribute fields. Bytes beyond this length are considered
padding and are neglected upon reception. If the length of a received packet is less than this
length, the packet is dropped. The value of this field is in the range 20 to 4096.
4. The Authenticator field (16 byte long) is used to authenticate replies from the RADIUS server and
to encrypt user passwords. There are two types of authenticators: request authenticator and
response authenticator.
5. The Attributes field, variable in length, carries the specific authentication, authorization, and
accounting information that defines the configuration details of the request or response. This field
may contain multiple attributes, each with three sub-fields: Type, Length, and Value.
Type (1 byte long)—Indicates the type of the attribute. It is in the range 1 to 255. Commonly used
attributes for RADIUS authentication, authorization and accounting are listed in Table 128.
Length (1 byte long)—Indicates the length of the attribute in bytes, including the Type, Length, and
Value fields.
Value (up to 253 bytes)—Value of the attribute. Its format and content depend on the Type and
Length fields.
Table 128 RADIUS attributes
No. Attribute No. Attribute
1 User-Name 45 Acct-Authentic
2 User-Password 46 Acct-Session-Time
3 CHAP-Password 47 Acct-Input-Packets
4 NAS-IP-Address 48 Acct-Output-Packets
5 NAS-Port 49 Acct-Terminate-Cause
6 Service-Type 50 Acct-Multi-Session-Id
7 Framed-Protocol 51 Acct-Link-Count
8 Framed-IP-Address 52 Acct-Input-Gigawords
9 Framed-IP-Netmask 53 Acct-Output-Gigawords
10 Framed-Routing 54 (unassigned)
11 Filter-ID 55 Event-Timestamp
12 Framed-MTU 56-59 (unassigned)
13 Framed-Compression 60 CHAP-Challenge
14 Login-IP-Host 61 NAS-Port-Type
15 Login-Service 62 Port-Limit
16 Login-TCP-Port 63 Login-LAT-Port
17 (unassigned) 64 Tunnel-Type
18 Reply_Message 65 Tunnel-Medium-Type
19 Callback-Number 66 Tunnel-Client-Endpoint
20 Callback-ID 67 Tunnel-Server-Endpoint
21 (unassigned) 68 Acct-Tunnel-Connection
22 Framed-Route 69 Tunnel-Password
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