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CSF – How to limit the number of connections per IP address

November 17, 2016 by mkyong

In the ConfigServer Security & Firewall (CSF) configuration file, update the CT_LIMIT value to limit the number of connections per IP address. This is a simple trick to prevent some types of Denial of Service (DOS) attack. Note To stop the Denial of Service (DoS) attack immediately, read this null route example. 1. /etc/csf/csf.conf SSH …

How to block Denial of Service (DoS) with null route

November 17, 2016August 27, 2012 by mkyong

This article is described how I find out the Denial of Service (DoS) IP and null route it, to solve the high load issue on my server. 1. High Load Recently, the server has hit an abnormally high load, CPU usage hits, average 15-20%. #top load average: 15.08, 18.30, 20.63 2. Who is Connected? Not …