Iptables example


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iptables

Program that allows configuration of tables, chains and rules provided by the Linux kernel firewall.

  • View chains, rules, and packet/byte counters for all tables:

sudo iptables -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 of a given table to a file:

sudo iptables-save -t {{tablename}} > {{path/to/iptables_file}}

  • Restore iptables configuration from a file:

sudo iptables-restore < {{path/to/iptables_file}}