How To Stop or Block The PING response in linux / Ubuntu

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Define PING... 
                           
                 Ping is a computer network administration utility used to test the reachability of a host on an Internet Protocol (IP) network and to measure the round-trip time for messages sent from the originating host to a destination computer. The name comes from active sonar terminology which sends a pulse of sound and listens for the echo to detect objects underwater. With computer operating systems Ping or PING stands for Packet INternet Groper but is ordinarily written as "ping" instead of the proper acronym for which it stands.--- Wikipedia

If your system response the the hacker will try to hack your system.. if you turn off the ping its much of safe..

Now go to file system : /etc/init.d/networking and type :...
echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all
to re-enable
echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_all
Stop Hackers......

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