Lookup.setDefaultCache(null, DClass.IN);
Lookup.setDefaultSearchPath(new Name[] {});
if (dnsTestServer == null) {
try {
dnsTestServer = new DNSTestingServer("0.0.0.0", ""+FAKE_SERVER_PORT);
} catch (TextParseException e) {
throw new RuntimeException("Error trying to instantiate the testing dns server.", e);
} catch (IOException e) {
throw new RuntimeException("Error trying to instantiate the testing dns server.", e);
}