I have used CSF and set it up using Block Permanently all negative ips by using the LFD configuration. This will block IPs that attempt to login incorrectly or exploit your SSH port amongst other ports and various software.
Hi,
I require a free firewall solution for Centos for a client of mine.I dont know any good ones and wanted to ask that would the DDoS protection and ssl certification enough for his private project which operates over UDP and a web server.