[168962] in North American Network Operators' Group
Re: Need trusted NTP Sources
daemon@ATHENA.MIT.EDU (Jared Mauch)
Fri Feb 7 13:28:49 2014
From: Jared Mauch <jared@puck.nether.net>
In-Reply-To: <483E6B0272B0284BA86D7596C40D29F90233E61638F0@PUR-EXCH07.ox.com>
Date: Fri, 7 Feb 2014 13:14:09 -0500
To: Matthew Huff <mhuff@ox.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Feb 7, 2014, at 10:56 AM, Matthew Huff <mhuff@ox.com> wrote:
> Working in the financial world, the best practices is to have 4 ntp =
servers (if not using PTP).
>=20
> 1) You need 3 to determine the correct time (and detect bad tickers)
> 2) If you lose 1 of the 3 above, then you no longer can determine the =
correct time
> 3) Therefore with 4, you have redundancy.
>=20
> We have two Symmetricom Stratum 1 time servers synced via GPS with =
Rubidium oscillators, and two RHEL 6 servers running ntpd for our 4 =
servers.
Having a number of NTP servers will help you detect false tickers which =
may be critical.
If you want something that is "cheap" as in you for your home, I can =
recommend this: ~$350 w/ antenna, etc..
http://www.netburnerstore.com/product_p/pk70ex-ntp.htm
You can get the whole thing going quickly. Majdi has also had good luck =
with this unit (perhaps he wants to chime-in, heh pun unintended) =
regarding a few other devices.
If you ask politely off-list, I will point you at where one of these is =
that you can talk to (in Dallas at the Infomart for your low-latency =
config).
- Jared=
