MoinQ:

DNS/実装/KnotDNSresolver/bugについて、ここに記述してください。

d.qmail.jpがcutであることを認識させられた。 

[plan] plan 'b.c.d.qmail.jp.' type 'A'
[plan]   plan 'a.ns.d.qmail.jp.' type 'AAAA'
[resl]     => querying: '14.192.44.5' score: 71 zone cut: 'qmail.jp.' m12n: 'D.QmaiL.JP.' type: 'NS'
[iter]     <= rcode: NOERROR
[iter]     <= found cut, retrying with non-minimized name
[resl]     => querying: '14.192.44.5' score: 57 zone cut: 'qmail.jp.' m12n: 'A.ns.d.QmaIl.jp.' type: 'AAAA'
[iter]     <= rcode: NOERROR
[ pc ]     => answer cached for TTL=900
[plan]   plan 'a.ns.d.qmail.jp.' type 'A'
[resl]     => querying: '14.192.44.5' score: 79 zone cut: 'qmail.jp.' m12n: 'D.qmaIl.JP.' type: 'NS'
[iter]     <= rcode: NOERROR
[iter]     <= found cut, retrying with non-minimized name
[resl]     => querying: '14.192.44.5' score: 61 zone cut: 'qmail.jp.' m12n: 'a.NS.d.qMAiL.JP.' type: 'A'
[iter]     <= rcode: NOERROR
[resl]   => querying: '14.192.44.5' score: 70 zone cut: 'd.qmail.jp.' m12n: 'C.D.Qmail.Jp.' type: 'NS'
[iter]   <= rcode: NOERROR
[iter]   <= found cut, retrying with non-minimized name
[ pc ]   => answer cached for TTL=900
[resl]   => querying: '14.192.44.5' score: 68 zone cut: 'd.qmail.jp.' m12n: 'b.c.D.qmail.Jp.' type: 'A'
[iter]   <= rcode: NOERROR
[ pc ]   => answer cached for TTL=900
[resl] finished: 4, queries: 3, mempool: 16392 B

この状態で、 $ kdig -t a x.b.c.d.qmail.jp @127.0.0.3 

;; ->>HEADER<<- opcode: QUERY; status: NXDOMAIN; id: 13127
;; Flags: qr rd ra; QUERY: 1; ANSWER: 0; AUTHORITY: 1; ADDITIONAL: 0

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

;; AUTHORITY SECTION:
d.qmail.jp.             2560    IN      SOA     a.ns.d.qmail.jp. hostmaster.d.qmail.jp. 1444708370 16384 2048 1048576 2560

;; Received 86 B
;; Time 2015-10-13 19:37:00 JST
;; From 127.0.0.3@53(UDP) in 157.3 ms

[plan] plan 'x.b.c.d.qmail.jp.' type 'A'
[resl]   => querying: '14.192.44.5' score: 71 zone cut: 'd.qmail.jp.' m12n: 'c.D.qmAIL.JP.' type: 'NS'
[iter]   <= rcode: NOERROR
[iter]   <= found cut, retrying with non-minimized name
[ pc ]   => answer cached for TTL=900
[resl]   => querying: '14.192.44.5' score: 76 zone cut: 'd.qmail.jp.' m12n: 'x.B.c.d.QMAil.jP.' type: 'A'
[iter]   <= rcode: NXDOMAIN
[ pc ]   => answer cached for TTL=900
[resl] finished: 4, queries: 1, mempool: 16392 B