Linux for Networking Professionals by Rob VandenBrink

Author:Rob VandenBrink
Language: eng
Format: epub
Publisher: Packt Publishing Limited
Published: 2021-09-16T00:00:00+00:00

Table 9.1 – RADIUS codes

The Packet ID field is what is used to tie together the request and the response packet. Since RADIUS is a User Datagram Protocol (UDP) protocol, there's no concept of a session at the protocol level—this has to be in the payload of the packet.

The Authenticator field is unique to each packet and is supposed to be randomly generated.

The remainder of the packet consists of attribute-value pairs (commonly called AV pairs). Each one is labeled AVP in the packet. This makes the protocol extensible; both the NAS and the RADIUS server can add AV pairs as circumstances dictate. There are several AV pairs commonly supported in all implementations, as well as several vendor-specific AV pairs that are usually tied to the NAS vendor and specific situations—for instance, to differentiate between administrative access to a device and user access to a VPN or wireless service set ID (SSID). We'll cover this in more depth as we explore some use cases later in this chapter.

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