tldr/pages/linux/iptables.md

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# iptables
> Program that allows to configure tables, chains and rules provided by the Linux kernel firewall.
- See chains and rules for specific table:
`sudo iptables -t {{table_name}} -vnL`
- Set chain policy rule:
`sudo iptables -p {{chain}} {{rule}}`
- Append rule to chain policy for IP:
`sudo iptables -A {{chain}} -s {{ip}} -j {{rule}}`
- Append rule to chain policy for IP considering protocol and port:
`sudo iptables -A {{chain}} -s {{ip}} -p {{protocol}} --dport {{port}} -j {{rule}}`
- Delete chain rule:
`sudo iptables -D {{chain}} {{rule_line_number}}`
- Save iptables configuration:
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`sudo iptables-save > {{path/to/iptables_file}}`