Mikrotic Help awaited

All the dears, please tell me how can u limit the all P2P traffic to 256kbps ?

what is the difference between term “POSTROUTING, OUTPUT, PREROUTING and Masquerade” in mangle tab, and what are their functions…

best regards to all the dears…

Maybe this will help:
http://en.wikipedia.org/wiki/Iptables
Check the chapter “Operational summary”…
and
http://en.wikipedia.org/wiki/IP_masquerading