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Ping command is intact for mutual detection line between a computer application, the transfer of data exchange between computers without any encryption processing, so we use the ping command to detect when one of the servers, there may be an illegal on the Internet molecules, through a dedicated network hacking program on the information transmitted halfway line to steal and theft over the use of the information on the specified server or system attack, for which we need to prohibit the use of Linux commands on a Linux system. In Linux, if it is to make the ping response is not to ignore the ICMP packet, so we can enter the following command at the Linux command line:
echo 1> / proc / sys / net / ipv4 / icmp_echo_igore_all
If you want to resume using the ping command, you can enter:
echo 0> / proc / sys / net / ipv4 / icmp_echo_igore_all command. |
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