DNS/CnameZone/unboundについて、ここに記述してください。
unboundもいい加減ですね。
$ dig -t ns oss.jp @127.0.0.2
; <<>> DiG 9.9.5-3ubuntu0.5-Ubuntu <<>> -t ns oss.jp @127.0.0.2 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41392 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;oss.jp. IN NS ;; ANSWER SECTION: oss.jp. 259181 IN NS ns1.oss.jp. oss.jp. 259181 IN NS ns2.oss.jp. oss.jp. 86381 IN CNAME oss.jp.s3-website-ap-northeast-1.amazonaws.com. ;; Query time: 0 msec ;; SERVER: 127.0.0.2#53(127.0.0.2) ;; WHEN: Sat Dec 05 17:30:26 JST 2015 ;; MSG SIZE rcvd: 131