Also, I have read that dns leaks is dangerous when it comes to anonymity online. Why is that? For all I know I am using my isp's dns (is there a way to test which dns server I am using?). Can sites I visit record which dns server I used to resolve their host? If so how do I change to use an "anonymous" dns or better options?
I'd be very greatful for any response to clear these questions. Have a good day all =)