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

~% 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。