how to limit simultaneous connections in WAN interface

Hi friends -
i use adsl modem before my MT and i need to limit connections to 200 on WAN on MT -
pls some help


http://www.mikrotik.com/testdocs/ros/2.9/ip/filter.php

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To only allow not more than 5 simultaneous connections from each of the clients, do the following:

/ip firewall filter add chain=forward protocol=tcp tcp-flags=syn connection-limit=6,32 action=drop

This don’t work in my MT - pls some help
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