[168719] in North American Network Operators' Group
Re: TWC (AS11351) blocking all NTP?
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Mon Feb 3 16:11:27 2014
To: Joe Greco <jgreco@ns.sol.net>
In-Reply-To: Your message of "Mon, 03 Feb 2014 11:29:21 -0600."
<201402031729.s13HTLRO033987@aurora.sol.net>
From: Valdis.Kletnieks@vt.edu
Date: Mon, 03 Feb 2014 16:07:52 -0500
Cc: "John R. Levine" <johnl@iecc.com>, Joel M Snyder <Joel.Snyder@Opus1.COM>,
nanog list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Mon, 03 Feb 2014 11:29:21 -0600, Joe Greco said:
> There's a bootstrap issue here. I'm guessing that you may be picturing
> a scenario where a network operator simply queries to obtain the list of
> ntp.org servers and special-cases their own. However, I believe that
> the system won't add NTP servers that appear to be nonresponsive to the
> list (bootstrap paradox), and in any case the list of returned servers
> is quite large and a response basically picks a few random servers, so
> it is quite difficult to know what servers are on your network in an
> automated fashion.
And even harder to identify stuff that's downstream at one of your
customer's sites.
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