natpmpc - NAT-PMP library test client and mapping setter.

       In  order  to  remove  a  mapping,  set it with a lifetime of 0 seconds.  To remove all mappings for your
       machine, use 0 as private port and lifetime.

                                                                                                      natpmpc(1)

       natpmpc - NAT-PMP library test client and mapping setter.

       Display the public IP address:
       natpmpc

       Add a port mapping:
       natpmpc -a <public port> <private port> <protocol> [lifetime]