@param external_addr - external IPv4 address of the service
@param external_port - external L4 port number of the service
@param protocol - IP protocol number of the service
@param external_addr - external IPv4 address of the service
@param external_port - external L4 port number of the service
@param protocol - IP protocol number of the service
@param twice_nat - if 1 translate external host address and port
@param self_twice_nat - if 1 translate external host address and port
whenever external host address equals
@param twice_nat - if 1 translate external host address and port
@param self_twice_nat - if 1 translate external host address and port
whenever external host address equals
@param external_addr - external IPv4 address of the service
@param external_port - external L4 port number of the service
@param protocol - IP protocol number of the service
@param external_addr - external IPv4 address of the service
@param external_port - external L4 port number of the service
@param protocol - IP protocol number of the service
@param twice_nat - if 1 translate external host address and port
@param self_twice_nat - if 1 translate external host address and port
whenever external host address equals
@param twice_nat - if 1 translate external host address and port
@param self_twice_nat - if 1 translate external host address and port
whenever external host address equals