[165604] in North American Network Operators' Group
Re: DNS Reliability
daemon@ATHENA.MIT.EDU (Rubens Kuhl)
Thu Sep 12 16:39:55 2013
In-Reply-To: <CAPhg-wQDwJKeXS437bQon3mbVaDKW0YQitKTMNrB0_UheYzk2Q@mail.gmail.com>
Date: Thu, 12 Sep 2013 17:39:42 -0300
From: Rubens Kuhl <rubensk@gmail.com>
To: Phil Fagan <philfagan@gmail.com>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Thu, Sep 12, 2013 at 5:03 PM, Phil Fagan <philfagan@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
