What is the IPTABLES command?

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What is the IPTABLES command?

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The IPTABLES command is used to create and configure IP-tables that contains rules for packet filtering. The default filter table contains Input, Output, or Forward chains. Various command parameters are used with the IPTABLES command to perform a specific action on the specified chains. Some of the important parameters are listed below:

Parameter	Description
-A	Appends the specified IP-table rule.
-D n	Deletes the n(th) rule in the specified chain.
-F	Deletes (or flushes) every rule in the specified chain. If no chain is specified, it deletes the rules from all chains.
-h	Provides help by listing the command structures and summary of command parameters and options.

Note: All the parameters should be provided in uppercase except the -h parameter.

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