}

func getNextPort() string {
	return strconv.Itoa(int(atomic.AddUint32(&serverPort, 1)))
}

func getNonLoopBackIP(t *testing.T) string {
	localIP4 := set.NewStringSet()
	addrs, err := net.InterfaceAddrs()
	if err != nil {
		t.Fatalf("%s.  Unable to get IP addresses of this host.", err)
	}

	for _, addr := range addrs {
		var ip net.IP
		switch v := addr.(type) {
		case *net.IPNet:
			ip = v.IP

pkg net, func FilePacketConn(*os.File) (PacketConn, error)
pkg net, func IPv4(uint8, uint8, uint8, uint8) IP
pkg net, func IPv4Mask(uint8, uint8, uint8, uint8) IPMask
pkg net, func InterfaceAddrs() ([]Addr, error)
pkg net, func InterfaceByIndex(int) (*Interface, error)
pkg net, func InterfaceByName(string) (*Interface, error)
pkg net, func Interfaces() ([]Interface, error)