assertThrows(
          "IllegalArgumentException expected for '" + nonTeredoAddress + "'",
          IllegalArgumentException.class,
          () -> InetAddresses.getTeredoInfo((Inet6Address) ip));
    }

    String validTeredoAddress = "2001:0000:4136:e378:8000:63bf:3fff:fdd2";
    String serverStr = "65.54.227.120";
    String clientStr = "192.0.2.45";
    int port = 40000;

      assertThrows(
          "IllegalArgumentException expected for '" + nonTeredoAddress + "'",
          IllegalArgumentException.class,
          () -> InetAddresses.getTeredoInfo((Inet6Address) ip));
    }

    String validTeredoAddress = "2001:0000:4136:e378:8000:63bf:3fff:fdd2";
    String serverStr = "65.54.227.120";
    String clientStr = "192.0.2.45";
    int port = 40000;

   * @return extracted {@code TeredoInfo}
   * @throws IllegalArgumentException if the argument is not a valid IPv6 Teredo address
   */
  public static TeredoInfo getTeredoInfo(Inet6Address ip) {
    checkArgument(isTeredoAddress(ip), "Address '%s' is not a Teredo address.", toAddrString(ip));

    byte[] bytes = ip.getAddress();