[169012] in North American Network Operators' Group
Re: Need trusted NTP Sources
daemon@ATHENA.MIT.EDU (Jay Ashworth)
Sun Feb 9 15:16:52 2014
Date: Sun, 9 Feb 2014 15:16:25 -0500 (EST)
From: Jay Ashworth <jra@baylink.com>
To: NANOG <nanog@nanog.org>
In-Reply-To: <20140209080346.GA6967@pob.ytti.fi>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
----- Original Message -----
> From: "Saku Ytti" <saku@ytti.fi>
> > In the architecture I described, though, is it really true that the
> > odds of the common types of failure are higher than with only one?
>
> I think so, lets assume arbitrarily that probability of NTP server not
> starting to give incorrect time is 99% over 1 year time.
> Then either of two servers not giving incorrect time is 0.99**2 i.e. 98%, so
> two NTP servers would be 1% point more likely to give incorrect time than one
> over 1 year time.
That's only true if the two devices have common failure modes, though,
is it not?
--
Jay R. Ashworth Baylink jra@baylink.com
Designer The Things I Think RFC 2100
Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII
St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274
