[70643] in North American Network Operators' Group
Re: ntp config tech note
daemon@ATHENA.MIT.EDU (John Kristoff)
Thu May 20 21:18:46 2004
Date: Thu, 20 May 2004 20:18:10 -0500
From: John Kristoff <jtk@northwestern.edu>
To: nanog@nanog.org
In-Reply-To: <20040520213322.GA32355@puck.nether.net>
Errors-To: owner-nanog-outgoing@merit.edu
On Thu, 20 May 2004 17:33:22 -0400
Jared Mauch <jared@puck.nether.net> wrote:
> I'm also wondering, how many people are using the ntp.mcast.net
> messages to sync their clocks? what about providing ntp
We have had one user that I know of who was receiving time sync info
via multicast announcements, but personally I don't care for doing NTP
this way. In my experience systems/users don't bother to do any sort
of authentication or filtering on NTP sources. Most server admins and
some implementations do not support authentication either. I'm pretty
sure I don't want to get time from just anyone who sends to 224.0.1.1
especially on networks connected to the multicast-enabled Internet.
That group address I might note is one I tend to scope at admin
boundaries for just that reason.
John
