Simple filtering on CSF for small attacks
If CentOS: yum install perl-libwww-perl
Else: apt install libwww-perl
Then install: cd /usr/src wget https://download.configserver.com/csf.tgz
Unzipping: tar xzf csf.tgz cd csf
Starting install process: sh install.sh perl /usr/local/csf/bin/csftest.pl
Stopping fwall: systemctl stop firewalld systemctl disable firewalld
Update CSF.conf: Coming Soon..
Then restart & testing ;)