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

[Stephane Bortzmeyer]

On Mon, Mar 21, 2016 at 06:13:35PM +0100,
 Florian Weimer <fw at deneb.enyo.de> wrote 
 a message of 32 lines which said:

> This test is not valid for an authoritative server because you sent
> an RD=1 query.

It is valid. When the authoritative server works (as it does now, the
problem is fixed), it is not a problem if I request a recursion it
does not want to provide:

% 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: 32790
;; flags: qr aa rd; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 10
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 2800
;; QUESTION SECTION:
;he.net.                        IN NS

;; ANSWER SECTION:
he.net.                 86400 IN NS ns1.he.net.
he.net.                 86400 IN NS ns3.he.net.
he.net.                 86400 IN NS ns5.he.net.
he.net.                 86400 IN NS ns4.he.net.
he.net.                 86400 IN NS ns2.he.net.

;; ADDITIONAL SECTION:
ns1.he.net.             86400 IN A 216.218.130.2
ns5.he.net.             86400 IN AAAA 2001:470:500::2
ns5.he.net.             86400 IN A 216.66.80.18
ns2.he.net.             86400 IN AAAA 2001:470:200::2
ns4.he.net.             86400 IN A 216.66.1.2
ns3.he.net.             86400 IN AAAA 2001:470:300::2
ns2.he.net.             86400 IN A 216.218.131.2
ns3.he.net.             86400 IN A 216.218.132.2
ns4.he.net.             86400 IN AAAA 2001:470:400::2

;; Query time: 164 msec
;; SERVER: 216.218.130.2#53(216.218.130.2)
;; WHEN: Tue Mar 22 09:05:55 CET 2016
;; MSG SIZE  rcvd: 317