![]() ![]() The lowercase word on top is the table and the uppercase word below is the chain. 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. || portmaster-stub-bin AUR Basic concepts
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