Linux allow, disable ping packets

The Linux system allows pings by default, but in some cases we set the server to no ping for security reasons

Temporarily allow the ping command to use the command:

echo 0 >/proc/sys/net/ipv4/icmp_ignore_all:0, delegate allowed; 1, delegate Forbidden

1. View current settings:

For 0, so we can ping it and try

2, use the ping command to test

Use-T to ping continuously

3, permanently allow or disallow ping, modify configuration file/etc/sysctl.conf

Add a row as shown, net.ipv4.icmp_echo_ignore_all=1

1 is forbidden, 0 means allow the modification to be completed after saving exit

4, execute sysctl-p to make the new configuration take effect

5, re-test the ping situation

, after the configuration takes effect again the ping command cannot ping the same IP, if you want to permanently allow the ping command, just change the configuration file 1 to 0

Linux allow, disable ping packets