[outages] ntp.org DNS lookups failing

[Gert Doering]

Hi,

On Wed, Jan 18, 2017 at 02:15:32PM -0600, Douglas K. Rand via Outages wrote:
> All of our DNS queries in the ntp.org zone seem to be failing.
> 
> Checked a few public DNS servers, such as Google's 8.8.8.8 and 8.8.4.4,
> and they are missing it also.

This looks like a name server set change, and the old servers failed /
stopped to answer.  

One of our recursives lists these

;; ANSWER SECTION:
ntp.org.                74239   IN      NS      ns2.everett.org.
ntp.org.                74239   IN      NS      ns1.ntp.org.
ntp.org.                74239   IN      NS      ns2.ntp.org.
ntp.org.                74239   IN      NS      ns1.everett.org.

... and returns SERVFAIL to "pool.ntp.org" queries.

The other one lists these:

;; ANSWER SECTION:
ntp.org.                3509    IN      NS      anyns.pch.net.
ntp.org.                3509    IN      NS      ns2.everett.org.
ntp.org.                3509    IN      NS      ns3.p20.dynect.net.
ntp.org.                3509    IN      NS      dns2.udel.edu.
ntp.org.                3509    IN      NS      ns1.p20.dynect.net.
ntp.org.                3509    IN      NS      ns2.p20.dynect.net.
ntp.org.                3509    IN      NS      ns1.everett.org.
ntp.org.                3509    IN      NS      dns1.udel.edu.
ntp.org.                3509    IN      NS      ns4.p20.dynect.net.

... and happily answers queries....

Trying to query directly, ns1/ns2.ntp.org return SERVFAIL as well,
and ns1/ns2.everett.org do not reply at all... so pure guesswork on
my side says "the original set is broken / under attack / ..., so
new servers have been added, but as long as the old NS records are
still being cached, things keep failing".

gert
-- 
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de