DNS Reliability

Valdis.Kletnieks at vt.edu Valdis.Kletnieks at vt.edu
Fri Sep 13 00:45:21 UTC 2013

On Thu, 12 Sep 2013 14:03:44 -0600, Phil Fagan said:
> Everything else remaining equal...is there a standard or expectation for
> DNS reliability?
> 98%
> 99%
> 99.5%
> 99.9%
> 99.99%
> 99.999%
> Measured in queries completed vs. queries lost.
> Whats the consensus?

Remember to factor in Duane Wessel's work that showed that something
like 98% of the DNS traffic at the root servers was totally bogus?

Maybe you need to factor in "broken queries not answered, and offenders slapped
around with a large trout"?  Because if it's busted requests you're sending
towards the root, they're going to count against your completed/lost ratio in a
really bad way.

Anybody know if people have cleaned up their collective acts since Duane
did that paper?

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