[Q] "unknown IP address" mean in dynamic-clients

Hello, members. Could you tell me "unknown IP address" mean in dynamic-clients file? It means that the IP doesn't match client.conf. Is this correct? https://github.com/FreeRADIUS/freeradius-server/blob/v3.0.x/raddb/sites-avai...

When the server receives a packet from an unknown IP address within that network, it tries to find a dynamic definition for that client. If the definition is found, the IP address

Best regards. -- Hiroyuki Sato