iptables DDOS

Unfortunately can't say with 100% certainty it would be when Centmin Mod uses CSF Firewall. Centmin Mod's CSF Firewall is just a wrapper to iptables so you can still use iptables rules if you know how CSF Firewall works by placing iptables rules in custom setup /etc/csf/csfpre.sh script with executable permissions which runs those iptables rules before CSF Firewall loads it's rules.

Best to try a on test Centmin Mod VPS install and see how you go. But it would have to be non-openvz based i.e. KVM/Xen or bare bones dedicated as the articles required kernel/TCP settings won't work with openvz vps as you won't have permissions under openvz vpses to make such changes.

Also you'd have to be fully be aware what those changes outlined in the article do and also how to revert/undo those changes if you run into problems. If you did place custom iptables rules in custom setup /etc/csf/csfpre.sh, then removing them is as easy as removing the iptable rules from custom setup /etc/csf/csfpre.sh and restarting CSF Firewall via command

Code (Text):

csf -ra

 

Also running command below lists all CSF Firewall's existing iptable rules so you can judge if any are already present

Code (Text):

csf -l

 

Also the article's mentioned ssh brute force and port flooding protections aren't needed as CSF Firewall natively has that CSF Firewall - CentminMod.com LEMP Nginx web stack for CentOS