We can make Linux box to ignore ping requests by edit the /etc/sysctl.conf file and add the below line,
net.ipv4.icmp_echo_ignore_all = 1
else use the below command to append the entry
# echo "net.ipv4.icmp_echo_ignore_all = 1" >> /etc/sysctl.conf
To activate the kernel parameters added in /etc/sysctl.conf file immediately at runtime, use below commands
# sysctl –p
Now the box which you have added the above parameter will not be pingable, it ignores the icmp requests.
