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iptables
Configure tables, chains and rules of the Linux kernel IPv4 firewall. Use
ip6tablesto set rules for IPv6 traffic. See also:iptables-save,iptables-restore. More information: https://manned.org/iptables.
- View chains, rules, packet/byte counters and line numbers for the filter table:
sudo iptables {{[-vnL --line-numbers|--verbose --numeric --list --line-numbers]}}
- Set chain policy rule:
sudo iptables {{[-P|--policy]}} {{chain}} {{rule}}
- Append rule to chain policy for IP:
sudo iptables {{[-A|--append]}} {{chain}} {{[-s|--source]}} {{ip}} {{[-j|--jump]}} {{rule}}
- Append rule to chain policy for IP considering protocol and port:
sudo iptables {{[-A|--append]}} {{chain}} {{[-s|--source]}} {{ip}} {{[-p|--protocol]}} {{tcp|udp|icmp|...}} --dport {{port}} {{[-j|--jump]}} {{rule}}
- Add a NAT rule to translate all traffic from the
192.168.0.0/24subnet to the host’s public IP:
sudo iptables {{[-t|--table]}} {{nat}} {{[-A|--append]}} {{POSTROUTING}} {{[-s|--source]}} {{192.168.0.0/24}} {{[-j|--jump]}} {{MASQUERADE}}
- Delete chain rule:
sudo iptables {{[-D|--delete]}} {{chain}} {{rule_line_number}}