DOS attack against DNS?

Tue Jan 17 05:20:15 UTC 2006

Did you notice that it was class "ANY" and not type "ANY" that Paul noted?
I've never ever heard of it being used anywhere....

As for ANY query type, what do you think will happen when you query with 
"ANY" to a host in a domain that is not in your local dns server cache?
And btw if it is in your dns cache, how predictable do you think such
results are going to be???

On Tue, 17 Jan 2006, Alon Tirosh wrote:

> Not true,. the ANY query has mutliple uses for consolidating multiple
> diagnostic queries into a single display, and also for diversion monitoring
> systems on small domains or groups of same. Not all of us have the resources
> (or time) of large ISPs behind us.
>
> On 15 Jan 2006 17:27:40 +0000, Paul Vixie <vixie at vix.com> wrote:
>>
>>> client xx.xx.xx.xx#6704: query: z.tn.co.za ANY ANY +E
>>
>> class "ANY" has no purpose in the real world, not even for debugging.  if
>> you see it in a query, you can assume malicious intent.  if you hear it in
>> a query, you can safely ignore that query, or at best, map it to class
>> "IN".
>> --
>> Paul Vixie