DNS/実装/KnotDNSresolver/cancer.cuore.jpについて、ここに記述してください。

$ kdig -t a cancer.cuore.jp @127.0.0.3 

;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 30316
;; Flags: qr rd ra; QUERY: 1; ANSWER: 2; AUTHORITY: 0; ADDITIONAL: 0

;; QUESTION SECTION:
;; cancer.cuore.jp.             IN      A

;; ANSWER SECTION:
cancer.cuore.jp.        3600    IN      CNAME   ns.cuore.jp.
ns.cuore.jp.            3600    IN      A       58.157.180.3

;; Received 69 B
;; Time 2015-10-19 13:44:31 JST
;; From 127.0.0.3@53(UDP) in 1799.9 ms

[plan] plan 'cancer.cuore.jp.' type 'A'
[plan]   plan 'f.root-servers.net.' type 'AAAA'
[resl]     => querying: '199.7.91.13' score: 10 zone cut: '.' m12n: 'net.' type: 'NS'
[iter]     <= referral response, follow
[resl]     => querying: '192.33.14.30' score: 10 zone cut: 'net.' m12n: 'root-servers.net.' type: 'NS'
[iter]     <= referral response, follow
[resl]     => querying: '192.33.4.12' score: 10 zone cut: 'root-servers.net.' m12n: 'f.root-servers.net.' type: 'AAAA'
[iter]     <= rcode: NOERROR
[resl]   => querying: '192.5.5.241' score: 10 zone cut: '.' m12n: 'jp.' type: 'NS'
[iter]   <= referral response, follow
[resl]   => querying: '210.138.175.244' score: 10 zone cut: 'jp.' m12n: 'cuore.jp.' type: 'NS'
[iter]   <= referral response, follow
[resl]   => querying: '58.157.180.3' score: 10 zone cut: 'cuore.jp.' m12n: 'cancer.cuore.jp.' type: 'A'
[iter]   <= rcode: NOERROR
[resl] finished: 4, queries: 2, mempool: 32784 B

CNAME返答につけられてくるAレコードを受け入れていることが読み取れる。　-- ToshinoriMaeno 2015-10-19 04:52:00

おまけを受け入れないようにパッチしてみた。　-- ToshinoriMaeno 2015-10-19 08:13:43 

[plan] plan 'cancer.cuore.jp.' type 'A'
[plan]   plan 'ns.cuore.jp.' type 'AAAA'
[resl]     => querying: '156.154.100.5' score: 10 zone cut: 'jp.' m12n: 'cuore.jp.' type: 'NS'
[iter]     <= referral response, follow
[resl]     => querying: '58.157.180.3' score: 10 zone cut: 'cuore.jp.' m12n: 'ns.cuore.jp.' type: 'AAAA'
[iter]     <= rcode: NOERROR
[ pc ]     => answer cached for TTL=900
[plan]   plan 'ns.cuore.jp.' type 'A'
[ rc ]     => satisfied from cache
[iter]     <= rcode: NOERROR
[resl]   => querying: '58.157.180.3' score: 91 zone cut: 'cuore.jp.' m12n: 'cancer.cuore.jp.' type: 'A'
[iter]   <= rcode: NOERROR
[iter]   <= cname chain, following
[plan] plan 'ns.cuore.jp.' type 'A'
[ rc ]   => satisfied from cache
[iter]   <= rcode: NOERROR
[resl] finished: 4, queries: 4, mempool: 16392 B