--port-forward-4 <rule>] [--loopback-4 <rule>] [--ipv6 on|off] [--port-forward-6 <rule>] [--loopback --port-forward-4 <rule>] [--loopback-4 <rule>] [--ipv6 on|off] [--port-forward-6 <rule>] [--loopback