DNS/設定/おかしな設定/siblings/unbound.logについて、ここに記述してください。

ubuntu 16.04 LTS, Unbound 1.5.8  
  
{{{
$ dig -t a a.ns.net.qmail.jp @127.0.0.3

; <<>> DiG 9.12.0 <<>> -t a a.ns.net.qmail.jp @127.0.0.3
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40465
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1220
;; QUESTION SECTION:
;a.ns.net.qmail.jp.		IN	A

;; ANSWER SECTION:
a.ns.net.qmail.jp.	300	IN	A	14.192.44.5

;; Query time: 42 msec
;; SERVER: 127.0.0.3#53(127.0.0.3)
;; WHEN: Mon Mar 26 08:49:32 JST 2018
;; MSG SIZE  rcvd: 62
}}}

{{{
[1522021772] unbound[2378:0] info: resolving a.ns.net.qmail.jp. A IN
[1522021772] unbound[2378:0] info: response for a.ns.net.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <jp.> 203.119.1.1#53
[1522021772] unbound[2378:0] info: query response was REFERRAL

[1522021772] unbound[2378:0] info: resolving qmail.jp. NS IN
[1522021772] unbound[2378:0] info: response for qmail.jp. NS IN
[1522021772] unbound[2378:0] info: reply from <jp.> 150.100.6.8#53
[1522021772] unbound[2378:0] info: query response was REFERRAL

[1522021772] unbound[2378:0] info: resolving a.ns.qmail.jp. A IN
[1522021772] unbound[2378:0] info: response for a.ns.net.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <qmail.jp.> 14.192.44.5#53
[1522021772] unbound[2378:0] info: query response was REFERRAL

[1522021772] unbound[2378:0] info: resolving net.qmail.jp. NS IN
[1522021772] unbound[2378:0] info: response for qmail.jp. NS IN
[1522021772] unbound[2378:0] info: reply from <qmail.jp.> 14.192.44.5#53
[1522021772] unbound[2378:0] info: query response was ANSWER
[1522021772] unbound[2378:0] info: response for a.ns.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <qmail.jp.> 14.192.44.5#53
[1522021772] unbound[2378:0] info: query response was nodata ANSWER
[1522021772] unbound[2378:0] info: response for net.qmail.jp. NS IN
[1522021772] unbound[2378:0] info: reply from <qmail.jp.> 14.192.44.5#53
[1522021772] unbound[2378:0] info: query response was REFERRAL

[1522021772] unbound[2378:0] info: resolving a.ns.com.qmail.jp. A IN
[1522021772] unbound[2378:0] info: response for a.ns.net.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <net.qmail.jp.> 14.192.44.29#53
[1522021772] unbound[2378:0] info: query response was NXDOMAIN ANSWER
[1522021772] unbound[2378:0] info: response for a.ns.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <qmail.jp.> 14.192.44.5#53
[1522021772] unbound[2378:0] info: query response was nodata ANSWER
[1522021772] unbound[2378:0] info: response for a.ns.net.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <net.qmail.jp.> 14.192.44.29#53
[1522021772] unbound[2378:0] info: query response was ANSWER
[1522021772] unbound[2378:0] info: response for a.ns.com.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <qmail.jp.> 14.192.44.5#53
[1522021772] unbound[2378:0] info: query response was ANSWER
[1522021772] unbound[2378:0] info: response for a.ns.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <qmail.jp.> 14.192.44.5#53
[1522021772] unbound[2378:0] info: query response was ANSWER
[1522021772] unbound[2378:0] info: response for net.qmail.jp. NS IN
[1522021772] unbound[2378:0] info: reply from <net.qmail.jp.> 14.192.44.29#53
[1522021772] unbound[2378:0] info: query response was ANSWER
[1522021772] unbound[2378:0] info: response for a.ns.com.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <qmail.jp.> 14.192.44.5#53
[1522021772] unbound[2378:0] info: query response was NXDOMAIN ANSWER
[1522021772] unbound[2378:0] info: response for a.ns.com.qmail.jp. A IN
[1522021772] unbound[2378:0] info: reply from <qmail.jp.> 14.192.44.5#53
[1522021772] unbound[2378:0] info: query response was ANSWER


}}}