tldr/pages/linux/iptables.md

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# iptables
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> Program that allows configuration of tables, chains and rules provided by the Linux kernel firewall.
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- View chains, rules, and packet/byte counters for all tables:
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`sudo iptables -vnL`
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- Set chain policy rule:
`sudo iptables -P {{chain}} {{rule}}`
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- 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 of a given table to a file:
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`sudo iptables-save -t {{tablename}} > {{path/to/iptables_file}}`
- Restore iptables configuration from a file:
`sudo iptables-restore < {{path/to/iptables_file}}`