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You can whitelist IP Address quickly using ConfigServer Firewall/Login Failure Daemon (CSF/LFD) by using the Quick Allow or editing Firewall Allow IPs but the number of IP Addresses kept by CSF/LFD is limited (by default is 100 or other numbers you specified in Firewall Configuration) as a large number of IP addresses create a large number of iptables rules (4 times the number of IP’s) which can cause problems on some systems where either the the number of iptables entries has been limited (esp VPS’s) or where resources are limited. This can result in slow network performance, or, in the case of iptables entry limits, can prevent your server from booting as not all the required iptables chain settings will be correctly configured.

CSF/LFD will removes oldest entries and replaced with new one. So how to make CSF/LFD make permanent whitelist IP Address? Here’s how:
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I was using ISPConfig, to ease my life configuring and managing WebServer at work and I am thinking to change IP Address of webserver to another segment. I got confused how to change the IP address of ISPConfig 2 so that all sites and system recognized and used the new IP properly. Luckily I am still subscribed to ISPConfig Forum and I found this thread which help me a lot. Below is copy of how to from that forum just incase the forum is down.

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cPanel has 1 main shared IP address which configured on Basic cPanel/WHM Setup, so you can’t add multiple accounts to use the same IP address, unless the account is reseller. So how do you add another main shared IP address?
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