RADIUS Client Integration in SMF
The RADIUS client pod resides in the protocol layer of the 5G architecture.
The following figure illustrates the integration of RADIUS Client in SMF.

Radius-EP App (RADIUS-Client Pod)—The RADIUS Client functionality is added in a new pod. It handles RADIUS protocol-specific functions, such as authentication and accounting.
SMF Service App (SMF Service Pod)—The SMF Service App provides PDU session service. During session establishment, the SMF service decides if the secondary authentication is required or not, and acts accordingly.
UDP-Proxy App (UDP-Proxy Pod)—The UDP-Proxy App is enabled with host-networking and, communicates the packets using external Virtual-IPs. All RADIUS packets are transmitted and received from an outside cluster using this application.