North American Network Operators Group
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Re: Interesting new dns failures

  • From: David Ulevitch
  • Date: Tue May 22 18:03:10 2007

Fergie wrote:

David,

As you (and some others) may be aware, that's an approach that we
(Trend Micro) took a while back, but we got a lot (that's an
understatement) of push-back from service providers, specifically,
because they're not very inclined to change out their infrastructure
(in this case, their recursive DNS) for something that could identify
these types of behaviors.

Was that the real reason?

Here's a crazy question... Did it by chance cost money? :-)

I'm not saying it should have been free just that the hesitation to roll it out *might* have been for factors besides the fact that it mitigated DNS based botnets.

How do operators decide the expense is worth it to mitigate spew coming out of their network? When their outbound DoS traffic exceeds their inbound transit ratios? :-)

-David



And actually, in the case you mentioned above -- to identify
this exact specific behavior.