[124278] in North American Network Operators' Group
Re: NTP clock source
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Mon Mar 29 13:02:32 2010
To: todd glassey <tglassey@earthlink.net>
In-Reply-To: Your message of "Mon, 29 Mar 2010 09:43:25 PDT."
<4BB0D8AD.6040502@earthlink.net>
From: Valdis.Kletnieks@vt.edu
Date: Mon, 29 Mar 2010 13:00:53 -0400
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Mon, 29 Mar 2010 09:43:25 PDT, todd glassey said:
> Why would you want a S-0 Clock??? You are not a time-space lab, and so
> you would want something like a stratum-2 time source which comes from a
> provable provider. There are laws by the way on what are official and
> non-official sources of time. In the US for instance these are 15 USC
> 271 and 272, and the right to deploy the time is codified in 15 USC 260
> so which source of time is used is important.
Actually reading sections 260, 271, and 272 doesn't seem to actually talk
much about it, and unless you really care in a legal sense if your time is
derived from a WWVB signal or a GPS clock, it probably doesn't matter. OK,
maybe if you're listening to the Canadian radio signal, or the European
competitor to the GPS constellation it matters. Does anybody *really* care,
given that all these sources are usually synced to each other well enough that
it doesn't matter accuracy-wise?
The reason he wants a stratum-zero clock source is because when he sets up his
server that reads from that clock, it will in NTP-speak end up being a
stratum-1 clock, which is what he wants to deploy, then when he distributes it
to other servers, they'll become the stratum-2 clocks you mention.
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