Message Format in .NET

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6.2.1 Message Format
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RADIUS packet format is also very simple and consists of a header, including code, ID, length and an authenticator field, followed by the payload, which is a list of zero or more attributes (Table 6.2). The calculation of authenticator field is covered in detail later on and the attribute field is described in the following subsection. The end of attribute list is indicated by the RADIUS length field in the header.
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Table 6.1 RADIUS attribute TLV format Attribute type Attribute length Attribute value Up to 1 octet (Max of 255 attributes) to describe the type of attribute Length of the attribute in octets, indicating the entire length of the attribute payload, included type and length fields Contains information that the attribute is supposed to carry
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Table 6.2 Packet format for RADIUS messages: a header followed by a number of attributes RADIUS packet format Field name Header Sub-field Code ID Length Authenticator Description Identifies type of RADIUS packet (access request, response, etc.) To match requests and responses 2 octet long showing the length of the entire message 16 octet value that is calculated as described later First attribute in the packet Last attribute in the packet
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Attribute 1 ... Attribute N
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AAA and Network Security for Mobile Access
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6.2.2 RADIUS Extensibility
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As mentioned earlier, the attributes are the main vehicle for carrying information over RADIUS messages. This means, the attributes also provide the opportunity to extend the functionality of RADIUS server to interact with many other entities and for many purposes. Also to support implementation-specific scenarios, vendor-specific attributes (VSA) can be defined, so that each vendor s NAS and RADIUS server can interact in a manner that is specific to the implementation defined by the vendor. RADIUS base specification [RADIUS2865] specifies around 40 attributes, while several other attributes are defined by later RFCs, some of which are mentioned in later sections of this text. The list of attributes is rather extensive, so, we will refrain from providing a comprehensive list here. For such lists, the reader is referred to the IETF specifications, specifically [RADIUS2865]. These lists typically also include the capability of each RADIUS messages to carry the attribute. Table 6.3 shows some examples. The IETF RADIUS extension working group [RADEXTWEB] is working actively on defining new attributes that extend RADIUS functionality in a way that preserves backward compatibility with the existing RADIUS deployments. Unfortunately due to the limited number of bits (8) in the type field of the attributes, the attribute space is limited to only 255 allowed attributes. This and the need for backward compatibility for the large RADIUS deployment base have caused the IETF RADIUS community to guard the attribute space tightly and strictly question any suggestions for standardization of new attributes. For more discussion, see the RADIUS issues section. It is also theoretically possible to extend RADIUS functionality by creating new RADIUS messages. However, to preserve backward compatibility, the group is refraining from doing so.
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6.2.3 Transport Reliability for RADIUS
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RADIUS can be considered as an application layer protocol, running over a transport protocol. At the time of the RADIUS specification, UDP was deemed more appropriate than TCP, due to the fact that TCP session establishment is a time-consuming process involving state machines. As will be discussed later, the lack of reliability support in UDP causes some serious problems for RADIUS, especially for accounting functions. IESG Note on reliability: It is interesting to note that the Internet Engineering Steering Group (IESG) which is the governing body of IETF, has issued a note on the front page of RADIUS RFC, stating that RADIUS suffers from performance degradation and packet loss in adverse network conditions and scalability and congestion controls should be better addressed in a successor AAA protocol.
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Table 6.3 Example of RADIUS attributes and the quantity of each carried by various RADIUS messages Attribute name User name User Password CHAP Password NAS IP address NAS port Attribute type 1 2 3 4 5 Access request 0 1 0 1 0 1 0 1 0 1 Access accept Access reject Access challenge 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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Remote Access Dial-In User Service (RADIUS)
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