For security resones we can disable ping response of our linux server, means other servers can not ping our server and our server can not be detectable for bots or scaning tools.
Disable ping response Temporarily
To disable the PING response, login as root and type the following command
To reenable the PING response do this:
Disable ping response Permanently
Edit the /etc/sysctl.conf file and add the following line
Execute sysctl -p to enforce this setting immediately