Hi, I have a multicast problem and I need a firewall roule that would block multicast on RB450G router

On WAN shich are connected 3 IPTV recivers and RB450G router for internet sharing
I have torched ether1 (connected to the wan swich) and I saw 3 connections with speed up to 6mbps
I guess that why I have high processor usage

Is it possible to block that multicast connections and releve cpu usage?
If someone know how to make that firewall roule please make an example.

connections I saw in torch are
source address: XXX.XX.XXX.XXX I dist. address: XXX.X.X.XXX

I have tried with filter roule:
chain=forward action=drop src-address=XXX.XX.XXX.0/24
dst-address=XXX.X.X.0/24 in-interface=ether1

anyone?

anyone?

try to block the traffic on wan switch....

it is only a simple 5 port ethernet switch