Turn off icmp request

How to turn off ping request?

Open /etc/sysctl.conf in vi editor and write as follows

#sysctl –a |grep icmp

net.ipv6.icmp.ratelimit = 250
net.ipv4.netfilter.ip_conntrack_icmp_timeout = 30
net.ipv4.icmp_ratemask = 6168
net.ipv4.icmp_ratelimit = 250
net.ipv4.icmp_errors_use_inbound_ifaddr = 0
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_echo_ignore_all = 1

(Copy the last line and paste that into /etc/sysctl.conf)

#vi /etc/sysctl.conf

net.ipv4.icmp_echo_ignore_all=1

#/sbin/sysctl –P or reboot

Restart your box