Make IPTables Rules Permanent

To make iptables rules permanent, we need to save them to a configuration files and ensure they are restored on each boot. The following assumes that the current rules enabled are those to be made permanent. Save current rules to config file

Edit /etc/rc.local as root and add the following

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Use IPSet to Block Multiple IPs

Instead of adding individual IP addresses that need to be blocked to IPTables, it is easier to maintain a a single blacklist using IPSet and reference it in IPTables. Install IPSet

Create the blacklist list

Tell IPTables to reference the newly created list

Add an IP to the list to test

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