Attributes

The information the Radius requests carry is stored as a list of Attribute-Value pairs. Each pair consists of Attribute number and Attribute value. The Attribute number identifies the type of information the pair carries and the Attribute Value keeps the actual data.

The Value part of an attribute can contain the data of one of the following types:

Integer

A 32-bit unsigned integer value.

IP-number

An IPv4 IP-number.

String

A character string up to 253 characters long.

For convenience, the attributes and the values of some frequently used integer attributes are given symbolic names. These names are assigned to attributes and values in the dictionary file section Dictionary of Attributes -- `raddb/dictionary'.

The attribute numbers range from 1 to 255. The attributes with the numbers greater than 255 are used internally by the sever and cannot be sent to the NAS.

The special attribute 26, Vendor-Specific, is available to allow vendors of the NAS hardware or software to support their own extended attributes. section Vendor-Specific.

Each attribute has a set of properties associated with it. The properties are:

usage flags

These flags determine usage of the attribute in configuration files `huntgroups', `hints' and `users'.

propagation

When a radius server functions in proxy mode, it uses the propagation bit to determine which attributes from the reply packet should be passed back to the requesting NAS (see section Proxy Service).

additivity

Some configuration rules may cause addition of new A/V pairs to the incoming request. Before addition of a new pair, radiusd scans the request to see if it already contains a pair with the same attribute. If it does, the value of additivity determines the further actions:

None

The old pair is retained in the request, the new pair is not added to it.

Replace

The old pair is retained in the request, but its value is replaced with that of the new pair.

Append

The new pair is appended to the end of the pair list.

The attributes are declared in `raddb/dictionary' file. For a detailed description of it, See section ATTRIBUTE statement. For information about particular attributes, See section Attribute List.

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