Net/Traffic monitor

Hi guys,
I need a some traffic monitor of in/outgoing (k)bytes for each internal network IP adresses, it is request of our vendor, probably they want have a reports about traffic to internet of their eployees. How can I get this report from MikroTik? It is possible?

Thnx.

PS: I hope that I’m not much OT.

Traffic Flow / IP Accounting / Dummy simple queues (no traffic shaping or rate limiting applied, one queue per IP address - queues have counters for traffic)

Or using simple firewall filter rules per each IP and direction with action passthrough.
http://wiki.mikrotik.com/wiki/Traffic-flow
http://wiki.mikrotik.com/wiki/Use_SSH_to_execute_commands_(DSA_key_login)

Traffic-flow should get the most detailed informations usable for graphing too
http://ensight.eos.nasa.gov/FlowViewer/