Disable ping problems

I want to disable the ping in my server. I have installed CSF Firewall so I go to ICMP_IN =Off to disable the ping. I restart the service, but I try one of my dominans and I get ping response.... also I check the proc/sys/net/ipv4/icmp_echo_ignore_all has the value 0 So I don't know what's wrong ..... Colud you help me? Thank You