DNS/オープンリゾルバー/atについて、ここに記述してください。

1. vul

89.185.121.250 pns1.netplanet.at.

37.235.1.177 resolver2.freedns.zone.powered.by.emerion.com.

80.243.170.25 dns1.gol.at.

%dig +nocookie -t txt b.sub.mufj.jp @80.243.170.25                      ~

; <<>> DiG 9.12.1 <<>> +nocookie -t txt b.sub.mufj.jp @80.243.170.25
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: FORMERR, id: 14296
;; flags: qr rd ra ad; QUERY: 0, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; WARNING: EDNS query returned status FORMERR - retry with '+noedns'

;; Query time: 274 msec
;; SERVER: 80.243.170.25#53(80.243.170.25)
;; WHEN: Sun Feb 24 21:26:03 JST 2019
;; MSG SIZE  rcvd: 12

%dig +noedns -t txt d.sub.mufj.jp @80.243.170.25                        ~

; <<>> DiG 9.12.1 <<>> +noedns -t txt d.sub.mufj.jp @80.243.170.25
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41348
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;d.sub.mufj.jp.                 IN      TXT

;; ANSWER SECTION:
d.sub.mufj.jp.          600     IN      TXT     "Your_cache_server_is_vulnerable."

;; AUTHORITY SECTION:
sub.mufj.jp.            120     IN      NS      ns.sub.mufj.jp.

;; ADDITIONAL SECTION:
ns.sub.mufj.jp.         120     IN      A       14.192.44.1

;; Query time: 594 msec
;; SERVER: 80.243.170.25#53(80.243.170.25)
;; WHEN: Sun Feb 24 21:27:06 JST 2019
;; MSG SIZE  rcvd: 109