How to enable or disable ping under Debian/Centos

1. It is actually very simple, modify it under SSH:

vi /etc/sysctl.conf

Uncomment net.ipv4.icmp_echo_ignore_all if it is in the file, and then modify it. If not, add it.

net.ipv4.icmp_echo_ignore_all=0

Indicates that ping is allowed

net.ipv4.icmp_echo_ignore_all=1

Indicates that ping is prohibited

Finally, just restart.

2. Check whether it can be pinged

cat /proc/sys/net/ipv4/icmp_echo_ignore_all

Returning 0 means it is possible, returning 1 means it is not possible.

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