Best free DNS servers?

How can I stop someone from using the contents of my website by pointing his DNS to my servers?

• Someone is using the content from my domain by pointing his dns servers to my dns servers and he is displaying the site as it is. How can i prevent him from using my dns ?

• Answer:

  You should activate name-based virtual hosting and only  show your real website for the desired domain names. For all other  names, you can display a suitable error message. Details: Your webserver is contacted by its IP  address. There is nothing you can do to stop that. Anyone can say,  "connect to that IP address". For instance, anyone can register new  domain names to point to your server's IP address. However, inside the  request, there is a field Host with a name like http://www.example.com. Upon receiving the request, your server may choose to inspect the Host  field and deliver different content depending on that value. In the  simplest case, the server ignores the field entirely and always prints  out the same content. But in a more sophisticated set-up, so called  "name-based (virtual) hosting", the server chooses the content depending  on the hostname. This is how shared webhosts work: There's a single server, but  depending on the requested hostname it spits out a different website for  each name. Therefore, if you want to tie your server content to your hostname,  you have to tell your server to produce your website only for your  desired name, and to produce a different (error) website for all other  cases. In Apache this is trivial to configure, just check their  documentation; for IIS I wouldn't know but I imagine it's equally  simple.