My son plays league of legends too much and I currently block it by blocking the ports it commonly uses. this is on a netgear, I have all other configuration done to implement the 951 but this.
Service Type Port IP
1 LOL Patches 8393 all
2 LOL 5222..5223 all
3 lol udp 5100..5400 all
4 more lol 2099 all
thanks
Try this
ip firewall filter add chain=forward protocol=tcp dst-port=8393,5222,5223 action=drop
ip firewall filter add chain=forward protocol=udp dst-port=5100-5400,2099 action=drop