![]() The key to understanding how iptables works is this chart. Most new users find the complexities of linux IP routing quite daunting, but, in practice, the most common use cases (NAT and/or basic Internet firewall) are considerably less complex. iptables is the user utility which allows you to work with these chains/rules. If the IP packet reaches the end of a built-in chain, including an empty chain, then the chain's policy target determines the final destination of the IP packet. Each rule consists of a predicate of potential matches and a corresponding action (called a target) which is executed if the predicate is true i.e. The tables are made up of a set of predefined chains, and the chains contain rules which are traversed in order. The code for filtering IP packets is already built into the kernel and is organized into a collection of tables, each with a specific purpose. Iptables is used to inspect, modify, forward, redirect, and/or drop IP packets. It blocks connections to and from hosts specified in huge block lists (thousands or millions of IP ranges). PeerGuardian GUI (pglgui) - Privacy oriented firewall application.Gufw - GTK-based front-end to ufw which happens to be a CLI front-end to iptables (gufw->ufw->iptables), is super easy and super simple to use.firewalld (firewall-config) - Daemon and graphical interface for configuring network and firewall zones as well as setting up and configuring firewall rules.The program runs on Linux, FreeBSD, OpenBSD, Windows and macOS and can manage both local and remote firewalls. Firewall Builder - GUI firewall configuration and management tool that supports iptables (netfilter), ipfilter, pf, ipfw, Cisco PIX (FWSM, ASA) and Cisco routers extended access lists. ![]() It relies on ulogd to feed journald with dropped packet logs, and provides a log inspection framework with an emphasis on log access restriction. ![]() It uses service definitions provided by jhansonxi and used by ufw.
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