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