The goal is to configure the RADIUS client to send copies of RADIUS accounting messages to the BQN, as if the BQN server is a RADIUS server only for accounting. The following instructions are related to a Mikrotik PPPoE server, but similar steps can be followed for other vendors:

1. First, the existing RADIUS configuration should not be changed.

2. A new RADIUS server will be configured with the BQN as an Accounting backup server. To create a new RADIUS server, go to the RADIUS section and click on “Add New”. The following screen will be shown:

As it can be observed:

• The service of the router/switch should be enabled (usually ppp).
•  In “Address” the IP address will be the BQN management IP address (you can see which one it is in BQN GUI Configuration->Interfaces->Management).
• The field Accounting Backup must be selected (otherwise, the BQN would receive RADIUS Authentication and Authorization messages, which it does not support).
• The accounting port is left in its default value(1813).
• Optionally, a secret can be specified (if used, it must match the one configured in the BQN RADIUS configuration).
• Optionally, a Comment can add a description of the RADIUS server (e.g., “BQN RADIUS”).

3.      After creating the RADIUS server, the list should be as follows:

4. Make sure the service has RADIUS Interim Updates enabled and with a reasonable period (1-5 minutes). For example, for PPP, in option PPP->Secrets->PPP Authentication & Accounting.

The process must be repeated in all the nodes whose RADIUS is to be sent to the BQN.