/**
     * Returns all available IP addresses.
     * <p>
     * To get the first/main local ip only you could use also
     * {@link #getLocalIP() }.
     * <p>
     * In error case or if no network connection is established, we return
     * an empty list here.
     * <p>
     * Loopback addresses are excluded - so 127.0.0.1 will not be never
     * returned.
     * <p>
     * The "primary" IP might not be the first one in the returned list.
     *
     * @return  Returns all IP addresses (can be an empty list in error case
     *          or if network connection is missing).
     * @since   0.1.0
     */
    public static Collection<InetAddress> getAllLocalIPs()
    {
        LinkedList<InetAddress> listAdr = new LinkedList<InetAddress>();
        try
        {
            Enumeration<NetworkInterface> nifs = NetworkInterface.getNetworkInterfaces();
            if (nifs == null) return listAdr;

            while (nifs.hasMoreElements())
            {
                NetworkInterface nif = nifs.nextElement();
                // We ignore subinterfaces - as not yet needed.

                Enumeration<InetAddress> adrs = nif.getInetAddresses();
                while (adrs.hasMoreElements())
                {
                    InetAddress adr = adrs.nextElement();
                    if (adr != null && !adr.isLoopbackAddress() && (nif.isPointToPoint() || !adr.isLinkLocalAddress()))
                    {
                        listAdr.add(adr);
                    }
                }
            }
            return listAdr;
        }
        catch (SocketException ex)
        {
            Logger.getLogger(Net.class.getName()).log(Level.WARNING, "No IP address available", ex);
            return listAdr;
        }
    }