DNS Reliability

Thu Sep 12 20:49:57 UTC 2013

Thumbs up on this one; my entire path and chain of management of that path
need to be equally fault tolerant - Awesome.

On Thu, Sep 12, 2013 at 2:40 PM, Glen Wiley <glen.wiley at gmail.com> wrote:

> Remember though that anycast only solves for availability in one layer of
> the system and it is not difficult to create a less available anycast
> presence if you do silly things with the way you manage your routes. A
> system is only as available as the least available layer in that system
>
> For example, if you use an automated system that changes your route
> advertisements and that system encounters a defect that breaks your
> announcements then although a well built anycast footprint might acheive
> 99.999, a poorly implemented management system that is less available and
> creates an outage would reduce the number.
>
>
> On Thu, Sep 12, 2013 at 4:25 PM, Phil Fagan <philfagan at gmail.com> wrote:
>
> > Its a good point about the anycast; 99.999% should be expected.
> >
> >
> > On Thu, Sep 12, 2013 at 2:14 PM, Beavis <pfunix at gmail.com> wrote:
> >
> > > I go with 99.999% given that you have a good number of DNS Servers
> > > (anycasted).
> > >
> > >
> > > On Thu, Sep 12, 2013 at 9:03 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?
> > >>
> > >>
> > >> --
> > >> Phil Fagan
> > >> Denver, CO
> > >> 970-480-7618
> > >>
> > >
> > >
> > >
> > > --
> > > ()  ascii ribbon campaign - against html e-mail
> > > /\  www.asciiribbon.org   - against proprietary attachments
> > >
> > > Disclaimer:
> > > http://goldmark.org/jeff/stupid-disclaimers/
> > >
> >
> >
> >
> > --
> > Phil Fagan
> > Denver, CO
> > 970-480-7618
> >
>
>
>
> --
> Glen Wiley
> KK4SFV
>
> "A designer knows he has achieved perfection not when there is nothing left
> to add, but when there is nothing left to take away." - Antoine de
> Saint-Exupery
>

-- 
Phil Fagan
Denver, CO
970-480-7618