private String getGateWay() {
        String[] arr;
        try {
            Process process = Runtime.getRuntime().exec("ip route list table 0");
            String data = null;
            BufferedReader ie = new BufferedReader(new InputStreamReader(process.getErrorStream()));
            BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String string = in.readLine();

            arr = string.split("\\s+");
            return arr[2];
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "error";
    }