iptables: add page

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}}`
+
+- Savin iptables configuration:
+
+`sudo iptables-save > {{path_to_iptables_file}}`