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