## page was renamed from DNS/実装/KnotDNSresolver/youtube.com
DNS/実装/KnotDNSresolver/youtube.comについて、ここに記述してください。

www.youtube.com A を問い合せた。
{{{
$ dig -t a www.youtube.com @127.0.0.3

; <<>> DiG 9.9.5-3ubuntu0.5-Ubuntu <<>> -t a www.youtube.com @127.0.0.3
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39957
;; flags: qr rd ra; QUERY: 1, ANSWER: 17, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1452
;; QUESTION SECTION:
;www.youtube.com.		IN	A

;; ANSWER SECTION:
www.youtube.com.	86400	IN	CNAME	youtube-ui.l.google.com.
youtube-ui.l.google.com. 300	IN	A	210.139.253.237
youtube-ui.l.google.com. 300	IN	A	210.139.253.247
youtube-ui.l.google.com. 300	IN	A	210.139.253.226
youtube-ui.l.google.com. 300	IN	A	210.139.253.222
youtube-ui.l.google.com. 300	IN	A	210.139.253.251
youtube-ui.l.google.com. 300	IN	A	210.139.253.242
youtube-ui.l.google.com. 300	IN	A	210.139.253.236
youtube-ui.l.google.com. 300	IN	A	210.139.253.241
youtube-ui.l.google.com. 300	IN	A	210.139.253.227
youtube-ui.l.google.com. 300	IN	A	210.139.253.221
youtube-ui.l.google.com. 300	IN	A	210.139.253.216
youtube-ui.l.google.com. 300	IN	A	210.139.253.246
youtube-ui.l.google.com. 300	IN	A	210.139.253.231
youtube-ui.l.google.com. 300	IN	A	210.139.253.217
youtube-ui.l.google.com. 300	IN	A	210.139.253.212
youtube-ui.l.google.com. 300	IN	A	210.139.253.232

;; Query time: 1818 msec
;; SERVER: 127.0.0.3#53(127.0.0.3)
;; WHEN: Wed Oct 07 21:10:58 JST 2015
;; MSG SIZE  rcvd: 654
}}}

== log ==

{{{
[plan] plan 'www.youtube.com.' type 'A'
[plan]   plan 'j.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: '192.12.94.30' score: 10 zone cut: 'net.' m12n: 'ROOt-sERVERS.nET.' type: 'NS'
[iter]     <= referral response, follow
[resl]     => querying: '2001:503:ba3e::2:30' score: 10 zone cut: 'root-servers.net.' m12n: 'J.ROoT-SErVeRs.NeT.' type: 'AAAA'
[resl]        optional: '198.41.0.4' score: 10 zone cut: 'root-servers.net.' m12n: 'J.ROoT-SErVeRs.NeT.' type: 'AAAA'
[resl]     => NS unreachable, retrying over TCP
[resl]     => querying: '2001:503:ba3e::2:30' score: 10 zone cut: 'root-servers.net.' m12n: 'j.rOOT-SErvers.net.' type: 'AAAA'
[resl]        optional: '198.41.0.4' score: 10 zone cut: 'root-servers.net.' m12n: 'j.rOOT-SErvers.net.' type: 'AAAA'
[resl]     => querying: '2001:503:c27::2:30' score: 10 zone cut: 'root-servers.net.' m12n: 'j.rOOt-sERverS.nEt.' type: 'AAAA'
[resl]        optional: '192.58.128.30' score: 10 zone cut: 'root-servers.net.' m12n: 'j.rOOt-sERverS.nEt.' type: 'AAAA'
[plan] plan 'www.youtube.com.' type 'A'
[resl]   => querying: '192.203.230.10' score: 10 zone cut: '.' m12n: 'CoM.' type: 'NS'
[iter]   <= referral response, follow
[resl]   => querying: '2001:503:a83e::2:30' score: 10 zone cut: 'com.' m12n: 'yoUtUbE.com.' type: 'NS'
[resl]      optional: '192.5.6.30' score: 10 zone cut: 'com.' m12n: 'yoUtUbE.com.' type: 'NS'
[resl]     => NS unreachable, retrying over TCP
[resl]     => querying: '2001:503:c27::2:30' score: 10 zone cut: 'root-servers.net.' m12n: 'j.ROot-sErvers.NeT.' type: 'AAAA'
[resl]        optional: '192.58.128.30' score: 10 zone cut: 'root-servers.net.' m12n: 'j.ROot-sErvers.NeT.' type: 'AAAA'
[resl]     => querying: '2001:500:84::b' score: 10 zone cut: 'root-servers.net.' m12n: 'j.rooT-sERvErS.net.' type: 'AAAA'
[resl]        optional: '192.228.79.201' score: 10 zone cut: 'root-servers.net.' m12n: 'j.rooT-sERvErS.net.' type: 'AAAA'
[resl]   => NS unreachable, retrying over TCP
[resl]   => querying: '2001:503:a83e::2:30' score: 10 zone cut: 'com.' m12n: 'YoutuBE.COm.' type: 'NS'
[resl]      optional: '192.5.6.30' score: 10 zone cut: 'com.' m12n: 'YoutuBE.COm.' type: 'NS'
[resl]   => querying: '192.5.6.30' score: 10 zone cut: 'com.' m12n: 'youtubE.coM.' type: 'NS'
[iter]   <= referral response, follow
[resl]   => querying: '216.239.32.10' score: 10 zone cut: 'youtube.com.' m12n: 'WWw.yoUTUbE.cOM.' type: 'A'
[iter]   <= rcode: NOERROR
[iter]   <= cname chain, following
[plan] plan 'youtube-ui.l.google.com.' type 'A'
[resl]   => querying: '2001:503:231d::2:30' score: 10 zone cut: 'com.' m12n: 'GOoGlE.Com.' type: 'NS'
[resl]      optional: '192.33.14.30' score: 10 zone cut: 'com.' m12n: 'GOoGlE.Com.' type: 'NS'
[resl]     => NS unreachable, retrying over TCP
[resl]     => querying: '2001:500:84::b' score: 10 zone cut: 'root-servers.net.' m12n: 'j.ROOT-SErVeRs.net.' type: 'AAAA'
[resl]        optional: '192.228.79.201' score: 10 zone cut: 'root-servers.net.' m12n: 'j.ROOT-SErVeRs.net.' type: 'AAAA'
[resl]     => querying: '2001:500:2::c' score: 10 zone cut: 'root-servers.net.' m12n: 'j.rOOT-serVERs.Net.' type: 'AAAA'
[resl]        optional: '192.33.4.12' score: 10 zone cut: 'root-servers.net.' m12n: 'j.rOOT-serVERs.Net.' type: 'AAAA'
[plan] plan 'www.youtube.com.' type 'A'
[ rc ]   => satisfied from cache
[iter]   <= rcode: NOERROR
[iter]   <= cname chain, following
[plan] plan 'youtube-ui.l.google.com.' type 'A'
[resl]   => querying: '2001:503:231d::2:30' score: 10 zone cut: 'com.' m12n: 'gOoGlE.CoM.' type: 'NS'
[resl]      optional: '192.33.14.30' score: 10 zone cut: 'com.' m12n: 'gOoGlE.CoM.' type: 'NS'
[resl]   => NS unreachable, retrying over TCP
[resl]   => querying: '2001:503:231d::2:30' score: 10 zone cut: 'com.' m12n: 'gOOGLe.COM.' type: 'NS'
[resl]      optional: '192.33.14.30' score: 10 zone cut: 'com.' m12n: 'gOOGLe.COM.' type: 'NS'
[resl]   => querying: '192.35.51.30' score: 10 zone cut: 'com.' m12n: 'GoOGle.cOM.' type: 'NS'
[iter]   <= referral response, follow
[resl]   => querying: '216.239.34.10' score: 10 zone cut: 'google.com.' m12n: 'L.GOoglE.COm.' type: 'NS'
[iter]   <= rcode: NOERROR
[iter]   <= found cut, retrying with non-minimized name
[resl]   => querying: '216.239.36.10' score: 10 zone cut: 'google.com.' m12n: 'youTUbE-UI.L.GoOGLe.coM.' type: 'A'
[iter]   <= rcode: NOERROR
[resl] finished: 4, queries: 2, mempool: 32784 B
[resl]     => NS unreachable, retrying over TCP
[resl]     => querying: '2001:500:2::c' score: 10 zone cut: 'root-servers.net.' m12n: 'j.root-ServERs.NEt.' type: 'AAAA'
[resl]        optional: '192.33.4.12' score: 10 zone cut: 'root-servers.net.' m12n: 'j.root-ServERs.NEt.' type: 'AAAA'
[resl]     => querying: '192.33.4.12' score: 10 zone cut: 'root-servers.net.' m12n: 'J.roOt-SErvErs.Net.' type: 'AAAA'
[iter]     <= rcode: NOERROR
[ rc ]   => satisfied from cache
[iter]   <= rcode: NOERROR
[iter]   <= cname chain, following
[plan] plan 'youtube-ui.l.google.com.' type 'A'
[ rc ]   => satisfied from cache
[iter]   <= rcode: NOERROR
[resl] finished: 4, queries: 3, mempool: 32784 B
[resl]   => NS unreachable, retrying over TCP
[resl]   => querying: '2001:503:231d::2:30' score: 10 zone cut: 'com.' m12n: 'GOoglE.cOM.' type: 'NS'
[resl]      optional: '192.33.14.30' score: 10 zone cut: 'com.' m12n: 'GOoglE.cOM.' type: 'NS'
[resl]   => querying: '192.48.79.30' score: 10 zone cut: 'com.' m12n: 'goOgle.Com.' type: 'NS'
[iter]   <= referral response, follow
[resl]   => querying: '216.239.38.10' score: 10 zone cut: 'google.com.' m12n: 'l.GOogLe.cOm.' type: 'NS'
[iter]   <= rcode: NOERROR
[iter]   <= found cut, retrying with non-minimized name
[resl]   => querying: '216.239.32.10' score: 91 zone cut: 'google.com.' m12n: 'YoUtuBE-ui.l.GOOgle.Com.' type: 'A'
[iter]   <= rcode: NOERROR
[resl] finished: 4, queries: 2, mempool: 16392 B


}}}