Malicious DNS request?

Thu May 12 15:48:27 UTC 2005

At 11:26 AM -0400 2005-05-12, Valdis.Kletnieks at vt.edu wrote:

>  It's often suggested that you have *two* DNS setups - one that only answers
>  requests from inside for recursion and caching, and an authoritative one that
>  faces out and refuses to recurse.

	The original question from Joe Shen said that a remote computer 
was asking questions about certain servers, but did not specify 
whether or not the "remote computer" in question was a customer. 
Gadi's response was to refuse to answer requests for domains that you 
don't own, which didn't address the issue of whether or not the 
"remote computer" was a customer, or what kind of server that Joe was 
running.

	Your answer is the complete and correct one, at least for the 
technical issue of how you should br running your nameservers so that 
you avoid external abuse and reduce the probability of having your 
DNS servers compromised.

	It's taken us a while to get to this correct and complete answer, however.

-- 
Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.