Installed Linux computer to turn off the ping request can use the sysctl tool. For this you need something, switch to a console (terminal) sysctl -w net.ipv4.icmp_echo_ignore_all=1 to give the command. To ensure the permanence of this process /etc/sysctl.conf file net.ipv4.icmp_echo_ignore_all=1 is sufficient to add the line. Ping requests we want to turn it back on the same command can open ping requests to 0 ... 1 Source: http://linux-system-management.blogspot.com/