1. 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 2017-08-27 10:16:56
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
2. 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