"Recursive no;" implications?

[Dave Warren]

On 2014-01-22 00:43, Steven Carr wrote:
> Well they probably are being subjected to DDoS all the time, but
> Google uses their own DNS implementation so more than likely they have
> written in functionality to rate-limit and block specific
> clients/requests. They also have a lot of bandwidth and they have a
> lot of servers, using Anycast for distribution.
> http://en.wikipedia.org/wiki/Google_Public_DNS

The fact that they're using anycast possibly helps their code detect 
DDoS attempts too; if their anycast farm in India receives a request 
"from" an IP in the US with half a dozen closer anycast farms/points, it 
can potentially assume that that query is part of an attack and rate 
limit much more drastically than is normally done.

-- 
Dave Warren
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The cigarette does the smoking, you're just the sucker.