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You can easily troubleshoot RADIUS message flow by filtering wireshark pcap trace by filter "radius".
VEGA only has RADIUS client functionality; for RADIUS server, we can either use existing RADIUS server if present any, or download and install the great open source FreeRadius from www.freeradius.org.
In order to check how to configure FreeRadius with VEGA please refer to VEGA with FreeRadius.Here below is the screen capture of one RADIUS Accounting pcap trace:
