![]() Parameters set rule specifications for the commands used.The options recognized by iptables come in the following groups: Otherwise, it is equivalent to DROP so it is a terminatingĭrop halts a connection to a host without any communication unless Reject sends back an error packet in response to the matched This article covers only the most common policies:Īccept explicitly passes traffic through as long as no other target rules Thing to take away from the table above is that the default ruleset for that allĪvailable policies and other options are extensive. Takes care of the three major activities: incoming traffic (INPUT),įorwarded traffic (FORWARD), and outgoing traffic (OUTPUT). In a default install, you see three predefined Chains, a list of rules, that ![]() ![]() The command to list current rules is: sudo iptables -listĭefault output is: Chain INPUT (policy ACCEPT) An IP table is a firewall and networking tool available toĪll Linux distros and operates by analyzing packets at the kernel levelįor a comprehensive list of IP tables commands, parameters, and other This article explains how to use IP tables for a simple firewall andĭescribes the process of opening up holes in your firewall to necessary ![]()
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