How to Deny a Particular IP in a Linux Dedicated Server?

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Blocking IP temporarily:

Please note that you can temporarily block a particular IP like in seconds, minutes, hours and in days,

i) Login to your WHM
ii) Under plugin click on ConfigServer Security & Firewall
iii) In Temporary allow/Deny
Temporarily -> Choose block
IP address ->Mention the IP address to be blocked
for -> The amount of time you required that IP to be blocked

Finally Click on Temporary allow/Deny

Blocking IP permanently

i) Login to your WHM
ii) Under plugin click on ConfigServer Security & Firewall
iii) Enter IP in quick deny and click on quick deny