DNS Reliability

Thu Sep 12 20:39:42 UTC 2013

On Thu, Sep 12, 2013 at 5:03 PM, Phil Fagan <philfagan at gmail.com> wrote:

> 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?
>

ICANN new gTLD agreements specified 100% availability for the service,
meaning at least 2 DNS IP addresses answered 95% of requests within 500 ms
(UDP) or 1500 ms (TCP) for 51+% of the probes, or 99% availability for a
single name server, defined as 1 DNS IP address.

Rubens