UDP limit

Hello

How I can launch UDP limit connection?
I have a client who has 1,200 connections udp and he very load my rb.

What do you think about it??

add action=accept chain=forward connection-state=new disabled=no limit=50,5
protocol=udp src-address=192.168.3.2
add action=drop chain=forward connection-state=new disabled=no protocol=udp
src-address=192.168.3.2