[dns-operations] About open DNS resolvers

[Stephane Bortzmeyer]

On Mon, Aug 20, 2012 at 07:12:47PM +0200,
 esolve esolve <esolvepolito at gmail.com> wrote 
 a message of 104 lines which said:

> Why can we just use "dig @target_ip www.example.com" and see whether
> we can get a result?

If you go through China, you get a response even if the target_ip is
dead
<http://conferences.sigcomm.org/sigcomm/2012/paper/ccr-paper266.pdf>