DNS/KnotResolver/brau.internat.jp/brau.jpを乗取る/brau.jpの返答/奇妙なSOAについて、ここに記述してください。

$ dig -t a ns.brau.jp @127.0.0.1

; <<>> DiG 9.16.1-Ubuntu <<>> -t a ns.brau.jp @127.0.0.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 5279
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;ns.brau.jp.                    IN      A

;; AUTHORITY SECTION:
brau.jp.                453     IN      SOA     fake.brau.jp. hostmaster.brau.jp. 1598667800 16384 2048 1048576 2560

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: 土  8月 29 19:18:22 JST 2020
;; MSG SIZE  rcvd: 91

tmaeno@nve20:~$ dig -t soa brau.jp @127.0.0.1

; <<>> DiG 9.16.1-Ubuntu <<>> -t soa brau.jp @127.0.0.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 31853
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;brau.jp.                       IN      SOA

;; Query time: 15 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: 土  8月 29 19:19:09 JST 2020
;; MSG SIZE  rcvd: 36