== ルートゾーンKSK/日本では/dns-oarc.net/段階的検査/手元での結果 ==

この結果に到達するまでの原理が分からないのだが、
　途中の返答をしっかり受けとっていれば、こんなものか。
-- ToshinoriMaeno <<DateTime(2017-08-27T19:16:56+0900)>>

ゾーンサーバ側が返答サイズを決めて、送りつけている。
　それを受け取れれば次の問い合わせを送ってくる。(サイズは二分探索で精度を上げているのか）


$ dig rst.x4064.x4058.x4090.rs.dns-oarc.net. txt @ns00.x4064.x4058.x4090.rs.dns-oarc.net.
{{{
; <<>> DiG 9.11.1-P3 <<>> rst.x4064.x4058.x4090.rs.dns-oarc.net. txt @ns00.x4064.x4058.x4090.rs.dns-oarc.net.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7227
;; flags: qr aa; QUERY: 1, ANSWER: 3, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;rst.x4064.x4058.x4090.rs.dns-oarc.net. IN TXT

;; ANSWER SECTION:
rst.x4064.x4058.x4090.rs.dns-oarc.net. 57 IN TXT "39.110.135.12 DNS reply size limit is at least 4090"
rst.x4064.x4058.x4090.rs.dns-oarc.net. 57 IN TXT "39.110.135.12 sent EDNS buffer size 4096"
rst.x4064.x4058.x4090.rs.dns-oarc.net. 57 IN TXT "Tested at 2017-08-27 10:12:00 UTC"

;; AUTHORITY SECTION:
x4064.x4058.x4090.rs.dns-oarc.net. 57 IN NS	ns00.x4064.x4058.x4090.rs.dns-oarc.net.

;; ADDITIONAL SECTION:
ns00.x4064.x4058.x4090.rs.dns-oarc.net.	57 IN A	64.191.0.136

;; Query time: 119 msec
;; SERVER: 64.191.0.136#53(64.191.0.136)
;; WHEN: Sun Aug 27 19:12:00 JST 2017
;; MSG SIZE  rcvd: 264
}}}

== 始まりはこれ ==
$ dig rs.dns-oarc.net txt @a.gtld-servers.net
{{{
; <<>> DiG 9.11.1-P3 <<>> rs.dns-oarc.net txt @a.gtld-servers.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51611
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 7
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;rs.dns-oarc.net.		IN	TXT

;; AUTHORITY SECTION:
dns-oarc.net.		172800	IN	NS	sns-pb.isc.org.
dns-oarc.net.		172800	IN	NS	ns.dns-oarc.net.
dns-oarc.net.		172800	IN	NS	ns2.dns-oarc.net.
dns-oarc.net.		172800	IN	NS	ns3.dns-oarc.net.

;; ADDITIONAL SECTION:
ns.dns-oarc.net.	172800	IN	AAAA	2620:ff:c000:0:1::65
ns.dns-oarc.net.	172800	IN	A	64.191.0.65
ns2.dns-oarc.net.	172800	IN	A	192.211.126.36
ns2.dns-oarc.net.	172800	IN	AAAA	2604:1f80:5eb::3
ns3.dns-oarc.net.	172800	IN	AAAA	2a01:3f0:0:57::243
ns3.dns-oarc.net.	172800	IN	A	77.72.225.243

;; Query time: 7 msec
;; SERVER: 192.5.6.30#53(192.5.6.30)
;; WHEN: Sun Aug 27 19:17:41 JST 2017
;; MSG SIZE  rcvd: 257
}}}