1. DNS/CNAME/8.8.8.8

DNS/CNAME/odns.info

NS query に cname を返す。どう解釈すればいいのだろう。

• SERVFAILにしない理由はなにか。-- ToshinoriMaeno 2022-10-27 05:19:48

$ dig -t ns odns.info @8.8.8.8

; <<>> DiG 9.18.1-1ubuntu1.2-Ubuntu <<>> -t ns odns.info @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59924
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
; NSID: 67 70 64 6e 73 2d 6e 72 74 ("gpdns-nrt")
;; QUESTION SECTION:
;odns.info.                     IN      NS

;; ANSWER SECTION:
odns.info.              21600   IN      CNAME   moin.odns.info.

;; AUTHORITY SECTION:
odns.info.              1800    IN      SOA     a.ns.odns.info. hostmaster.odns.info. 1666842611 16384 2048 1048576 2560

;; Query time: 28 msec
;; SERVER: 8.8.8.8#53(8.8.8.8) (UDP)
;; WHEN: Thu Oct 27 13:34:33 JST 2022
;; MSG SIZE  rcvd: 122

$ dig mmm.dnsz.org @8.8.8.8

; <<>> DiG 9.16.1-Ubuntu <<>> mmm.dnsz.org @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58551
;; flags: qr rd ra cd; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;mmm.dnsz.org.                  IN      A

;; ANSWER SECTION:
mmm.dnsz.org.           3599    IN      CNAME   mmm.qmail.jp.

;; AUTHORITY SECTION:
qmail.jp.               899     IN      SOA     a.ns.qmail.jp. hostmaster.m.qmail.jp. 1628169048 16384 2048 1048576 900

;; Query time: 28 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: 月  8月 09 11:59:46 JST 2021
;; MSG SIZE  rcvd: 121