[70650] in North American Network Operators' Group
Re: ntp config tech note
daemon@ATHENA.MIT.EDU (Robert E. Seastrom)
Thu May 20 22:10:25 2004
To: "Hannigan, Martin" <hannigan@verisign.com>
Cc: nanog@nanog.org
From: "Robert E. Seastrom" <rs@seastrom.com>
Date: 20 May 2004 22:07:08 -0400
In-Reply-To: <6A8CA21E339F634E96E13AB97D732275EEFEEA@pro1wnexc01.vcorp.ad.vrsn.com>
Errors-To: owner-nanog-outgoing@merit.edu
"Hannigan, Martin" <hannigan@verisign.com> writes:
> That's NTPv4 isn't it?
>
> I also prefer to use three peers vs. two. Always an odd number,
> greater than 1. Assumptions can't be made about the mathematics
> behind time, but in a reference model, odd numbers are better.
Actually, three is not enough; Mills says at least four. Diversity in
manufacturer (and controlling organization if you can spare the
cycles) is a big big plus. You may wish to read Dr. Mills' post to
comp.protocols.time.ntp in the wake of the TrueTime bug of the
2001->2002 new year:
http://groups.google.com/groups?hl=en&selm=3C32924F.994E1D01%40udel.edu
---Rob
