hi there…
greet…
sorry for my bad english, and i am a newbiew 
i want to make RouterOS with bridging and bandwidth limiter function…
my local LAN now like this…
and i want to “place” a Mikrotik RoutersOS like this (act as bandwidth limiter)
can i do that??
how???
please help me
definitely can, you can start by RTFM.
http://www.mikrotik.com/testdocs/ros/2.9/guide/basic.php
the link you send is for NAT, i don’t use it…
see the diagram…
it’s transparently (in the same network)
Your looking for transparent bandwidth managment.
Check this link out to get you started
http://wiki.mikrotik.com/wiki/TransparentTrafficShaper