1. DNS/IPv6対応
root サーバの現状 -- ToshinoriMaeno 2010-07-24 03:06:27 %dnsq ns . m.root-servers.net
2 .: 492 bytes, 1+13+0+15 records, response, authoritative, noerror query: 2 . answer: . 518400 NS m.root-servers.net answer: . 518400 NS h.root-servers.net answer: . 518400 NS g.root-servers.net answer: . 518400 NS d.root-servers.net answer: . 518400 NS c.root-servers.net answer: . 518400 NS l.root-servers.net answer: . 518400 NS a.root-servers.net answer: . 518400 NS k.root-servers.net answer: . 518400 NS f.root-servers.net answer: . 518400 NS b.root-servers.net answer: . 518400 NS j.root-servers.net answer: . 518400 NS e.root-servers.net answer: . 518400 NS i.root-servers.net additional: a.root-servers.net 3600000 A 198.41.0.4 additional: b.root-servers.net 3600000 A 192.228.79.201 additional: c.root-servers.net 3600000 A 192.33.4.12 additional: d.root-servers.net 3600000 A 128.8.10.90 additional: e.root-servers.net 3600000 A 192.203.230.10 additional: f.root-servers.net 3600000 A 192.5.5.241 additional: g.root-servers.net 3600000 A 192.112.36.4 additional: h.root-servers.net 3600000 A 128.63.2.53 additional: i.root-servers.net 3600000 A 192.36.148.17 additional: j.root-servers.net 3600000 A 192.58.128.30 additional: k.root-servers.net 3600000 A 193.0.14.129 additional: l.root-servers.net 3600000 A 199.7.83.42 additional: m.root-servers.net 3600000 A 202.12.27.33 additional: a.root-servers.net 3600000 28 \040\001\005\003\272>\000\000\000\000\000\000\000\002\0000 additional: f.root-servers.net 3600000 28 \040\001\005\000\000/\000\000\000\000\000\000\000\000\000\017
512byte越えて additional section が切り捨てられていますね。 -- tss 2010-07-27 08:52:06
- 正確ではない。tinydns なら additional section 全体を落とすはずなので、 この動作をするのはtinydnsではない。glueはおまけの情報だから、さわぎたてなくてもいいかも。
~% drill -b 2048 ns . @m.root-servers.net ;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 54003 ;; flags: qr aa rd ; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 21 ;; QUESTION SECTION: ;; . IN NS ;; ANSWER SECTION: . 518400 IN NS a.root-servers.net. . 518400 IN NS j.root-servers.net. . 518400 IN NS g.root-servers.net. . 518400 IN NS k.root-servers.net. . 518400 IN NS m.root-servers.net. . 518400 IN NS f.root-servers.net. . 518400 IN NS e.root-servers.net. . 518400 IN NS l.root-servers.net. . 518400 IN NS h.root-servers.net. . 518400 IN NS d.root-servers.net. . 518400 IN NS b.root-servers.net. . 518400 IN NS i.root-servers.net. . 518400 IN NS c.root-servers.net. ;; AUTHORITY SECTION: ;; ADDITIONAL SECTION: a.root-servers.net. 3600000 IN A 198.41.0.4 b.root-servers.net. 3600000 IN A 192.228.79.201 c.root-servers.net. 3600000 IN A 192.33.4.12 d.root-servers.net. 3600000 IN A 128.8.10.90 e.root-servers.net. 3600000 IN A 192.203.230.10 f.root-servers.net. 3600000 IN A 192.5.5.241 g.root-servers.net. 3600000 IN A 192.112.36.4 h.root-servers.net. 3600000 IN A 128.63.2.53 i.root-servers.net. 3600000 IN A 192.36.148.17 j.root-servers.net. 3600000 IN A 192.58.128.30 k.root-servers.net. 3600000 IN A 193.0.14.129 l.root-servers.net. 3600000 IN A 199.7.83.42 m.root-servers.net. 3600000 IN A 202.12.27.33 a.root-servers.net. 3600000 IN AAAA 2001:503:ba3e::2:30 f.root-servers.net. 3600000 IN AAAA 2001:500:2f::f h.root-servers.net. 3600000 IN AAAA 2001:500:1::803f:235 i.root-servers.net. 3600000 IN AAAA 2001:7fe::53 j.root-servers.net. 3600000 IN AAAA 2001:503:c27::2:30 k.root-servers.net. 3600000 IN AAAA 2001:7fd::1 l.root-servers.net. 3600000 IN AAAA 2001:500:3::42 m.root-servers.net. 3600000 IN AAAA 2001:dc3::35
a, f だけに type28 をつけてくるサーバと、a,f,h,i に type28 をつけてくるサーバとに分類できるようです。
- 長い方は500バイトあります。tcp で問い合わせるようににはなっていないらしい。