Option 1:
Disable Ping:
echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all
Enable Ping:
echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all
Option 2:
Disable and enable ping in permanent way
Disable Ping:
Set the following into /etc/sysctl.conf file
net.ipv4.icmp_echo_ignore_all = 1
Reload /etc/sysctl.conf
sysctl -p
Enable Ping:
Set the following into /etc/sysctl.conf file
net.ipv4.icmp_echo_ignore_all = o
Reload /etc/sysctl.conf
sysctl -p
