Interesting new dns failures

David Ulevitch davidu at
Tue May 22 22:02:22 UTC 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? :-)


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

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