it seems that spaceflight.nasa.gov is served by buggy DNS server
implementation. it responds with NXDOMAIN when it should respond
with NOERROR with empty answer section. could you upgrade/
replace the nameserver, please? the behavior is serious as it
will prevent any of IPv6-ready client resolvers from contacting you.
itojun
% dig spaceflight.nasa.gov. aaaa
; <<>> DiG 9.2.1rc2 <<>> spaceflight.nasa.gov. aaaa
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 1362
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;spaceflight.nasa.gov. IN AAAA
;; ANSWER SECTION:
spaceflight.nasa.gov. 720 IN CNAME spaceflight.wip.nasa.gov.
;; AUTHORITY SECTION:
wip.nasa.gov. 10620 IN SOA 3dns.herndon.nasa.gov.
hostmaster.3dns.herndon.nasa.gov. 174616435 1953325427 1952805568 1349993967 2566914160
;; Query time: 54 msec
;; SERVER:
3ffe:501:4819:2000:5054:ff:feda:d161#53(3ffe:501:4819:2000:5054:ff:feda:d161)
;; WHEN: Fri Apr 26 10:14:36 2002
;; MSG SIZE rcvd: 169
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