Iptables Command Line Tool
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Internal
Overview
Commands
List Rules
iptables -L -nv --line-numbers
The command list all rules in the selected chain. If no chain is selected, all chains are listed.
The command applies to the specified table ("filter" is the default). If you need to list rules from a table other than "filter", use -t (example -t nat).
The command is often used with the -n option, in order to avoid long reverse DNS lookups.