As ISP, I want separate traffic and tag packets by destination ip address and then send to accounting software then set traffic to free or lower cost. I have multiple Mikrotik radio so i'll send IPFIX net flow traffic of radios to specific server the tag them by destination domain and IP address and at the end send them to my accounting server (radius server). I need a simple solution to do that with minimum overflow. So i think radius client can do that but i don't know how. please suggest best opensource software solution for that scenario.