Maybe you need to block attackers or simply stay safe on your Linux server
I’ve discovered several security fails on my system , one of them was not blocking ICMP packets
So I blocked doing this
1. Edit configuration file on /etc/sysctl.conf
2. Add the following line net.ipv4.icmp_echo_ignore_all = 1
now the ICMP traffic is blocked!
also type this command to kernel variable and drop all the packets
# echo ‘1’> /proc/sys/net/ipv4/icmp_echo_ignore_all
And you are done!