How to disable ping in Linux servers

Add the line

net.ipv4.conf.icmp_echo_ignore_all = 1
in /etc/sysclt.conf

To re-enable ping
echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all

Or add the line

net.ipv4.conf.icmp_echo_ignore_all = 0
in /etc/sysclt.conf

Alternatively, we can use IPtables to disable ping

# iptables -A INPUT -p icmp -j DROP