How do I disable ping on a linux server?

How do I disable ping on a linux server?
Sometimes we need to set the server to the ping prohibited mode. How can this problem be achieved? It's actually very easy! Modify the/proc/sys/net/ipv4/icmp_echo_ignore_all file as root. The default value is 0, indicating that the ping value can be changed to 1, indicating that ping is disabled. So let's modify it: prompt when vim/proc/sys/net/ipv4/icmp_echo_ignore_all is saved: why? Check the document and find that if you want to modify the value, you can echo 0 or 1 to this file. Knowing that proc/sys/net/ipv4/icmp_echo_ignore_all is not a real file, it will become invalid after the machine is restarted! To take effect permanently, write net. ipv4.icmp _ echo_ignore_all = 1 in/etc/sysctl. conf.