TWC (AS11351) blocking all NTP?

Valdis.Kletnieks at vt.edu Valdis.Kletnieks at vt.edu
Mon Feb 3 21:07:52 UTC 2014


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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