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* iptables: update page
* iptables-{restore,save}: add page
* ip6tables, ip6tables-{restore,save}: add alias page
* iptables-save: remove trailing whitespace
29 lines
1 KiB
Markdown
29 lines
1 KiB
Markdown
# iptables
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> Configure tables, chains and rules of the Linux kernel IPv4 firewall.
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> Use `ip6tables` to set rules for IPv6 traffic. See also: `iptables-save`, `iptables-restore`.
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> More information: <https://manned.org/iptables>.
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- View chains, rules, packet/byte counters and line numbers for the filter table:
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`sudo iptables --verbose --numeric --list --line-numbers`
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- Set chain [P]olicy rule:
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`sudo iptables --policy {{chain}} {{rule}}`
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- [A]ppend rule to chain policy for IP:
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`sudo iptables --append {{chain}} --source {{ip}} --jump {{rule}}`
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- [A]ppend rule to chain policy for IP considering [p]rotocol and port:
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`sudo iptables --append {{chain}} --source {{ip}} --protocol {{tcp|udp|icmp|...}} --dport {{port}} --jump {{rule}}`
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- Add a NAT rule to translate all traffic from the `192.168.0.0/24` subnet to the host's public IP:
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`sudo iptables --table {{nat}} --append {{POSTROUTING}} --source {{192.168.0.0/24}} --jump {{MASQUERADE}}`
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- [D]elete chain rule:
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`sudo iptables --delete {{chain}} {{rule_line_number}}`
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