DNS/1/CNAME/e-ontapについて、ここに記述してください。 cname.e-ontap.com A を19のリゾルバーに問い合わせたときの結果の分類 {{{ NoError 14, SERVFAIL 5 }}} NOERRORでもCNAMEはひとつだけ。 ---- cname.e-ontap.com A を27のリゾルバーに問い合わせたときの結果の分類 {{{ 5 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0   (SERVFAIL) 7 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 6 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 13, ADDITIONAL: 0 1 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 13, ADDITIONAL: 1 1 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 13, ADDITIONAL: 11 2 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 13, ADDITIONAL: 13 1 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 13, ADDITIONAL: 3 2 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2 2 ;; flags: qr rd; QUERY: 0, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 (REFUSED) }}} == zone server 返答 == {{{ ;; ANSWER SECTION: cname.e-ontap.com. 600 IN CNAME www.e-ontap.com. cname.e-ontap.com. 600 IN CNAME mx.e-ontap.com. }}} このような返答はすべきでないので、リゾルバーは捨ててもよい。 == resolver 返答例 == {{{ ;; ANSWER SECTION: cname.e-ontap.com. 599 IN CNAME www.e-ontap.com. www.e-ontap.com. 1799 IN A 150.42.6.5 }}}