On Thu, Jan 9, 2020 at 6:07 AM H <agents at meddatainc.com> wrote: > I am being attacked by an entire subnet where the first two parts of the > IP address remain identical but the last two parts vary sufficiently that > it is not caught by fail2ban since the attempts do not meet the cut-off of > a certain number of attempts within the given time. > > Has anyone created a fail2ban filter for this type of attack? As of right > now, I have manually banned a range of IP addresses but would like to > automate it for the future. > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos Hi, I am not an expert but, you can try creating an ipset with the the range you need and do a drop in iptables or firewalld. We have used ipsets with bare iptables in CentOS 6, and firewalld in CentOS 7. fail2ban also uses ipsets in CentOS 7. thanks -- Lee