Firewall

Different ways to handle.

Using on Debian
Note: In use on.

It's basically a set of  plugins for , which itself is a loader for different netfilter configuration. Once installed, it will take care of restoring rules at boot time, and through a small helper, can be used to reload/update/save rules on the fly.

Installation and config
apt install iptables-persistent netfilter-persistent
 * Installation:
 * Add/change iptables rules located at  and

Usage
netfilter-persistent reload iptables -L
 * Apply new rules after changes made to  files and check result

oneliners
iptables -L
 * list all rules from all chains