DHCP accounting and RADIUS packets

Hi all!
We try to use Mikrotik as router and DHCP server.
Switches send DHCP packets to Mtik, Mtik make req to Radius server and receive
dhcp pool name, speed limits…
All work good, but small problem.. No accounting :frowning:
And i don’t know IP address of user (from pool), traffic.
And don’t know when user stops use address

Maybe it’s possible:

  1. Send Accounting-Start packet with IP address, when lease and queue created and up?
  2. Send Accounting-Stop packet with traffic from queue (if created), when lease dropped?

Many people try to use Opt82 instead PPPxx, it’s may be a good solution.