[dns-operations] *.de kicked out of service due to NXDOMAIN

[Lutz Donnerhacke]

Since about an hour the DENIC servers respond NXDOMAIN (instead of NONAME)
for nonexisting record of existing labels.

; <<>> DiG 9.6.1-P1 <<>> aaaa L.DE.NET. @ns2.denic.de
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 56592
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;L.DE.NET.                      IN      AAAA

;; AUTHORITY SECTION:
DE.NET.                 1800    IN      SOA     ns1.denic.de. its.denic.de.
2009111301 10800 1800 3024000 1800

;; Query time: 33 msec
;; SERVER: 193.171.255.36#53(193.171.255.36)
;; WHEN: Fri Nov 13 15:06:55 2009
;; MSG SIZE  rcvd: 78

Because those NXDOMAINs are cached, the zone slightly disappears from the
net while the more specific entries times out ...

IPv6 enabled networks are the first to notice this effect.

DENIC is informed.