upnp

type NAT interface {
	// GetExternalAddress - Get the external address from outside the NAT.
	GetExternalAddress() (addr net.IP, e error)
	// AddPortMapping - Add a port mapping for protocol (
	//  "udp" or "tcp") from external port to internal port with description lasting
	// for timeout.
	AddPortMapping(
		protocol string, externalPort, internalPort int,
		description string, timeout int,
	) (mappedExternalPort int, e error)
	// DeletePortMapping - Remove a previously added port mapping from external
	// port to internal port.
	DeletePortMapping(
		protocol string, externalPort,
		internalPort int,
	) (e error)
}