[dns-operations] Very strange DNS bug at Hurricane Electric

[Stephane Bortzmeyer]

The authoritative name servers do reply, but only empty responses:

% dig @216.218.130.2             NS he.net

; <<>> DiG 9.10.2-P2 <<>> @216.218.130.2 NS he.net
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42388
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 1680
;; QUESTION SECTION:
;he.net.                        IN NS

;; Query time: 162 msec
;; SERVER: 216.218.130.2#53(216.218.130.2)
;; WHEN: Mon Mar 21 17:23:29 CET 2016
;; MSG SIZE  rcvd: 35
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From: "Daniel J. Grinkevich via Outages" <outages at outages.org>
Subject: Re: [outages] he.net Authoritative DNS down
Date: Mon, 21 Mar 2016 12:18:13 -0400
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