DNS/KnotResolver/d.qmail.jp/2について、ここに記述してください。

/res-log

$ kdig -t a a.b.c.d.qmail.jp @127.0.0.3
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 57800
;; Flags: qr rd ra; QUERY: 1; ANSWER: 0; AUTHORITY: 1; ADDITIONAL: 0

;; QUESTION SECTION:
;; a.b.c.d.qmail.jp.            IN      A

;; AUTHORITY SECTION:
a.b.c.d.qmail.jp.       2560    IN      SOA     a.ns.a.b.c.d.qmail.jp. hostmaster.a.b.c.d.qmail.jp. 1444734355 16384 2048 1048576 2560

;; Received 86 B
;; Time 2015-10-24 17:03:57 JST
;; From 127.0.0.3@53(UDP) in 173.1 ms

tmaeno@tmaeno:~$ kdig -t ns d.qmail.jp @127.0.0.3
;; ->>HEADER<<- opcode: QUERY; status: NXDOMAIN; id: 23681
;; Flags: qr rd ra; QUERY: 1; ANSWER: 0; AUTHORITY: 1; ADDITIONAL: 0

;; QUESTION SECTION:
;; d.qmail.jp.                  IN      NS

;; AUTHORITY SECTION:
qmail.jp.               2550    IN      SOA     f.ns.qmail.jp. hostmaster.m.qmail.jp. 1445673818 16384 2048 1048576 2560

;; Received 82 B
;; Time 2015-10-24 17:04:07 JST
;; From 127.0.0.3@53(UDP) in 0.2 ms

tmaeno@tmaeno:~$ kdig -t txt c.d.qmail.jp @127.0.0.3
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 20845
;; Flags: qr rd ra; QUERY: 1; ANSWER: 1; AUTHORITY: 0; ADDITIONAL: 0

;; QUESTION SECTION:
;; c.d.qmail.jp.                IN      TXT

;; ANSWER SECTION:
c.d.qmail.jp.           86400   IN      TXT     "c.d.qmail.jp"

;; Received 55 B
;; Time 2015-10-24 17:04:22 JST
;; From 127.0.0.3@53(UDP) in 79.7 ms

tmaeno@tmaeno:~$ kdig -t a c.d.qmail.jp @127.0.0.3
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 33423
;; Flags: qr rd ra; QUERY: 1; ANSWER: 0; AUTHORITY: 1; ADDITIONAL: 0

;; QUESTION SECTION:
;; c.d.qmail.jp.                IN      A

;; AUTHORITY SECTION:
d.qmail.jp.             2560    IN      SOA     a.ns.d.qmail.jp. hostmaster.d.qmail.jp. 1445673893 16384 2048 1048576 2560

;; Received 82 B
;; Time 2015-10-24 17:05:04 JST
;; From 127.0.0.3@53(UDP) in 64.0 ms

tmaeno@tmaeno:~$ dnsq ns d.qmail.jp f.ns.qmail.jp
2 d.qmail.jp:
47 bytes, 1+1+0+0 records, response, authoritative, noerror
query: 2 d.qmail.jp
answer: d.qmail.jp 259200 NS a.ns.d.qmail.jp

tmaeno@tmaeno:~$ dnsq a a.ns.d.qmail.jp f.ns.qmail.jp
1 a.ns.d.qmail.jp:
49 bytes, 1+1+0+0 records, response, authoritative, noerror
query: 1 a.ns.d.qmail.jp
answer: a.ns.d.qmail.jp 259200 A 14.192.44.29

tmaeno@tmaeno:~$ kdig -t a c.d.qmail.jp @127.0.0.3
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 46004
;; Flags: qr rd ra; QUERY: 1; ANSWER: 0; AUTHORITY: 1; ADDITIONAL: 0

;; QUESTION SECTION:
;; c.d.qmail.jp.                IN      A

;; AUTHORITY SECTION:
d.qmail.jp.             2451    IN      SOA     a.ns.d.qmail.jp. hostmaster.d.qmail.jp. 1445673893 16384 2048 1048576 2560

;; Received 82 B
;; Time 2015-10-24 17:06:53 JST
;; From 127.0.0.3@53(UDP) in 0.3 ms

tmaeno@tmaeno:~$ kdig -t txt c.d.qmail.jp @127.0.0.3
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 5935
;; Flags: qr rd ra; QUERY: 1; ANSWER: 1; AUTHORITY: 0; ADDITIONAL: 0

;; QUESTION SECTION:
;; c.d.qmail.jp.                IN      TXT

;; ANSWER SECTION:
c.d.qmail.jp.           86225   IN      TXT     "c.d.qmail.jp"

;; Received 55 B
;; Time 2015-10-24 17:07:17 JST
;; From 127.0.0.3@53(UDP) in 0.2 ms

tmaeno@tmaeno:~$ kdig -t txt b.c.d.qmail.jp @127.0.0.3
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 5851
;; Flags: qr rd ra; QUERY: 1; ANSWER: 1; AUTHORITY: 0; ADDITIONAL: 0

;; QUESTION SECTION:
;; b.c.d.qmail.jp.              IN      TXT

;; ANSWER SECTION:
b.c.d.qmail.jp.         86400   IN      TXT     "b.c.d.qmail.jp"

;; Received 59 B
;; Time 2015-10-24 17:07:25 JST
;; From 127.0.0.3@53(UDP) in 58.8 ms