static L<S> getMyIPs() ctex {
  new TreeSet<S> ips;
  Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
  while (interfaces.hasMoreElements()) {
    NetworkInterface iface = interfaces.nextElement();
    // filters out 127.0.0.1 and inactive interfaces
    if (iface.isLoopback() || !iface.isUp())
        continue;

    Enumeration<InetAddress> addresses = iface.getInetAddresses();
    while(addresses.hasMoreElements()) {
      InetAddress addr = addresses.nextElement();
      S ip = addr.getHostAddress();
      if (ip.startsWith("127.")) continue;
      ips.add(ip);
    }
  }
  return new ArrayList<S>(ips);
}