![]() Finally, the -j parameter stands for jump.The -s parameter, along with the IP address (198.51.100.0), indicates the source.To indicate a specific placement in the chain, you may also use a number with the -I option. Using a rule with the insertion option will add it to the beginning of a chain and will be applied first. Basic iptables Parameters and Syntaxīefore we begin creating rules, let’s review the syntax of an iptables rule.įor example, the following command adds a rule to the beginning of the chain that will drop all packets from the address 198.51.100.0: iptables -I INPUT -s 198.51.100.0 -j DROP The table contains a variety of built-in chains, but you can add your own. You can define different tables to handle these rules through chains, lists of rules that match a subset of packets. As stated above, iptables sets the rules that control network traffic. Many options can be used with the iptables command. ![]() Use Linux iptables to Manage IPv4 Traffic The iptables Command In order to use iptables, you will need root ( sudo) privileges. By default, the iptables tool is included with your Linode-supplied distribution. ![]()
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