What is the peer-to-peer protocol known as the next-generation version of RADIUS?

The next-generation version of RADIUS is known as Diameter. This protocol was designed to address the limitations of RADIUS by providing enhanced functionality, support for more complex scenarios, and improved security features. Diameter is more flexible and capable of handling a wider range of applications, including support for various types of authentication, authorization, and accounting transactions.

One of the key improvements in Diameter over RADIUS is the ability to handle larger message sizes, making it suitable for modern network requirements. Additionally, Diameter supports more robust error handling and communication between nodes, which increases its reliability in peer-to-peer environments.

In contrast to Diameter, Kerberos is a network authentication protocol designed specifically for secure identity verification, LDAP is a protocol used for accessing and maintaining distributed directory information services, and EAP (Extensible Authentication Protocol) is a framework used for network access authentication. Each of these alternatives serves different purposes in the realm of network security but does not function as a next-generation replacement for RADIUS like Diameter does.