DNS/KnotResolver/behavior/logについて、ここに記述してください。

$ dig -t ns a.b.c.d.qmail.jp

; <<>> DiG 9.11.1 <<>> -t ns a.b.c.d.qmail.jp
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29524
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 1b8b51920b954925b7172fe859069763a2be6c76b968613a (good)
;; QUESTION SECTION:
;a.b.c.d.qmail.jp.              IN      NS

;; ANSWER SECTION:
a.b.c.d.qmail.jp.       600     IN      NS      qmailzzz.e-ontap.com.

;; Query time: 54 msec
;; SERVER: 127.0.0.3#53(127.0.0.3)
;; WHEN: Mon May 01 11:03:15 JST 2017
;; MSG SIZE  rcvd: 107

1. log

@400000005906976d056fa3c4 [    0][plan] plan 'a.b.c.d.qmail.jp.' type 'NS'
@400000005906976d0574241c [26158][iter]   'a.b.c.d.qmail.jp.' type 'NS' id was assigned, parent id 0
@400000005906976d0574acd4 [26158][resl]   NT check; 
a
b
c
dqmailjp cut 
dqmailjp
@400000005906976d0574b0bc [26158][resl]   kr peekpkt 
b
c
dqmailjp ret -116
@400000005906976d0574d7cc [26158][resl]   kr peekpkt 
c
dqmailjp ret -2
@400000005906976d0574d7cc [14629][iter]   'a.b.c.d.qmail.jp.' type 'NS' id was assigned, parent id 0
@400000005906976d057554cc [14629][resl]   => querying: '14.192.44.29' score: 10 zone cut: 'd.qmail.jp.' m12n: 'C.d.QMaiL.JP.' type: 'NS' proto: 'udp'
@400000005906976d062b52a4 [14629][iter]   <= update zone cut name 
@400000005906976d062b568c [14629][iter]   <= using glue for 'a.ns.c.d.qmail.jp.': '14.192.44.5'
@400000005906976d062b5a74 [14629][iter]   <= referral response, follow
@400000005906976d062c0a3c [14629][resl]   <= server: '14.192.44.29' rtt: 11 ms
@400000005906976d062c508c [62155][iter]   'a.b.c.d.qmail.jp.' type 'NS' id was assigned, parent id 0
@400000005906976d062c873c [62155][resl]   => querying: '14.192.44.5' score: 10 zone cut: 'c.d.qmail.jp.' m12n: 'b.C.d.QMAiL.jP.' type: 'NS' proto: 'udp'
@400000005906976d06e6327c [62155][iter]   <= rcode: NXDOMAIN
@400000005906976d06e63664 [62155][iter]   <= found cut, retrying with non-minimized name
@400000005906976d06e6903c [62155][ pc ]   => answer cached for TTL=900
@400000005906976d06e6a7ac [62155][resl]   <= server: '14.192.44.5' rtt: 12 ms
@400000005906976d06e6bb34 [46646][iter]   'a.b.c.d.qmail.jp.' type 'NS' id was assigned, parent id 0
@400000005906976d06e7632c [46646][resl]   => querying: '14.192.44.5' score: 12 zone cut: 'c.d.qmail.jp.' m12n: 'a.B.C.D.QmAiL.jP.' type: 'NS' proto: 'udp'
@400000005906976d0797ee7c [46646][iter]   <= update zone cut name 
@400000005906976d0797f264 [46646][iter]   <= referral response, follow
@400000005906976d07986f64 [46646][resl]   <= server: '14.192.44.5' rtt: 11 ms
@400000005906976d079882ec [55574][iter]   'a.b.c.d.qmail.jp.' type 'NS' id was assigned, parent id 0
@400000005906976d07988ea4 [55574][plan]   plan 'qmailzzz.e-ontap.com.' type 'A'
@400000005906976d07989a5c [62907][iter]     'qmailzzz.e-ontap.com.' type 'A' id was assigned, parent id 55574
@400000005906976d07991b44 [62907][resl]     NT check;qmailzzze-ontapcom cut e-ontapcom
@400000005906976d07991f2c [62907][resl]     kr peekpktqmailzzze-ontapcom ret -2
@400000005906976d07992314 [63954][iter]     'qmailzzz.e-ontap.com.' type 'A' id was assigned, parent id 55574
@400000005906976d07992314 [63954][resl]     => querying: '49.212.106.253' score: 10 zone cut: 'e-ontap.com.' m12n: 'QmaILzZz.e-ONtaP.com.' type: 'A' proto: 'udp'
@400000005906976d08a7d00c [63954][iter]     <= rcode: NXDOMAIN
@400000005906976d08a80aa4 [63954][ pc ]     => answer cached for TTL=900
@400000005906976d08a80aa4 [63954][resl]     <= server: '49.212.106.253' rtt: 17 ms
@400000005906976d08a81e2c [25127][iter]   'a.b.c.d.qmail.jp.' type 'NS' id was assigned, parent id 0
@400000005906976d08a84154 [25127][ rc ]   => satisfied from rrcache
@400000005906976d08a850f4 [25127][iter]   <= rcode: NOERROR
@400000005906976d08a8f504 [    0][resl] finished: 4, queries: 2, mempool: 16400 B