ip firewall filter
add chain=forward src-address=192.168.0.0/24 dst-address=192.168.0.0/24 action=drop comment="Block client to client traffic in all ports" disabled=no


all clinet on same NIC conected togther using chipe swich

no way. if they are on the same network segment - they talk to each other directly, not via your router

lol i read it in other forum and thought if it is possible thx