ccTLD/cz/Knot-resolverについて、ここに記述してください。
- cz ccTLDとnic.czとは（親子）同居している。そして、Knot DNS Authritative serverなどを使っている。
- Knot resolver がどういうふるまいをするか、見てみよう。
-- ToshinoriMaeno 2015-10-14 06:36:06
$ kdig -t a podpora.nic.cz @127.0.0.3
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 60275 ;; Flags: qr rd ra; QUERY: 1; ANSWER: 2; AUTHORITY: 0; ADDITIONAL: 0 ;; QUESTION SECTION: ;; podpora.nic.cz. IN A ;; ANSWER SECTION: podpora.nic.cz. 1800 IN CNAME www.nic.cz. www.nic.cz. 1800 IN A 217.31.205.50 ;; Received 70 B ;; Time 2015-10-14 14:39:06 JST ;; From 127.0.0.3@53(UDP) in 937.5 ms
[plan] plan 'podpora.nic.cz.' type 'A' [resl] => root priming query [plan] plan '.' type 'NS' [resl] => querying: '192.228.79.201' score: 10 zone cut: '.' m12n: '.' type: 'NS' [iter] <= rcode: NOERROR [resl] => querying: '198.41.0.4' score: 10 zone cut: '.' m12n: 'Cz.' type: 'NS' [iter] <= referral response, follow [resl] => querying: '194.0.13.1' score: 10 zone cut: 'cz.' m12n: 'Nic.cz.' type: 'NS' [iter] <= rcode: NOERROR [iter] <= found cut, retrying with non-minimized name [resl] => querying: '194.0.12.1' score: 10 zone cut: 'cz.' m12n: 'pOdPorA.Nic.cz.' type: 'A' [iter] <= rcode: NOERROR [resl] finished: 4, queries: 2, mempool: 16392 B
nic.cz は子ゾーンなのだが、そうとは認められないらしい。(親子同居が理由なのだろう）
CNAMEの問い合せなおしもしていないのか。
$ kdig -t soa nic.cz @127.0.0.3
;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 28624 ;; Flags: qr rd ra; QUERY: 1; ANSWER: 1; AUTHORITY: 0; ADDITIONAL: 0 ;; QUESTION SECTION: ;; nic.cz. IN SOA ;; ANSWER SECTION: nic.cz. 1800 IN SOA a.ns.nic.cz. hostmaster.nic.cz. 1444344903 10800 3600 1209600 7200 ;; Received 76 B ;; Time 2015-10-14 14:42:31 JST ;; From 127.0.0.3@53(UDP) in 525.8 ms
[plan] plan 'nic.cz.' type 'SOA' [resl] => querying: '194.0.14.1' score: 10 zone cut: 'cz.' m12n: 'nic.Cz.' type: 'SOA' [iter] <= referral response, follow [resl] => querying: '193.29.206.1' score: 10 zone cut: 'nic.cz.' m12n: 'Nic.CZ.' type: 'SOA' [iter] <= rcode: NOERROR [resl] finished: 4, queries: 1, mempool: 16392 B
この状態では、なぜかzone扱いされている。
$ dnsq soa nic.cz a.ns.nic.cz
6 nic.cz: 254 bytes, 1+1+3+6 records, response, authoritative, noerror query: 6 nic.cz answer: nic.cz 1800 SOA a.ns.nic.cz hostmaster.nic.cz 1444344903 10800 3600 1209600 7200 authority: nic.cz 1800 NS b.ns.nic.cz authority: nic.cz 1800 NS d.ns.nic.cz authority: nic.cz 1800 NS a.ns.nic.cz additional: a.ns.nic.cz 1800 A 194.0.12.1 additional: a.ns.nic.cz 1800 28 \040\001\006x\000\017\000\000\000\000\000\000\000\000\000\001 additional: b.ns.nic.cz 1800 A 194.0.13.1 additional: b.ns.nic.cz 1800 28 \040\001\006x\000\020\000\000\000\000\000\000\000\000\000\001 additional: d.ns.nic.cz 1800 A 193.29.206.1 additional: d.ns.nic.cz 1800 28 \040\001\006x\000\001\000\000\000\000\000\000\000\000\000\001
Knot DNS (Authoritative Server) はauthority, additional は付けないのではなかったか。 ([abd].nic.cz はすべておなじ）
$ dnsq soa cz a.ns.nic.cz
6 cz: 138 bytes, 1+1+4+0 records, response, authoritative, noerror query: 6 cz answer: cz 18000 SOA a.ns.nic.cz hostmaster.nic.cz 1444799399 900 300 604800 900 authority: cz 18000 NS c.ns.nic.cz authority: cz 18000 NS a.ns.nic.cz authority: cz 18000 NS b.ns.nic.cz authority: cz 18000 NS d.ns.nic.cz
別のサーバに問い合わせてみると、
$ dnsq soa cz b.ns.nic.cz
6 cz: 279 bytes, 1+1+4+6 records, response, authoritative, noerror query: 6 cz answer: cz 18000 SOA a.ns.nic.cz hostmaster.nic.cz 1444799399 900 300 604800 900 authority: cz 18000 NS a.ns.nic.cz authority: cz 18000 NS b.ns.nic.cz authority: cz 18000 NS c.ns.nic.cz authority: cz 18000 NS d.ns.nic.cz additional: a.ns.nic.cz 18000 A 194.0.12.1 additional: a.ns.nic.cz 18000 28 \040\001\006x\000\017\000\000\000\000\000\000\000\000\000\001 additional: b.ns.nic.cz 18000 A 194.0.13.1 additional: b.ns.nic.cz 18000 28 \040\001\006x\000\020\000\000\000\000\000\000\000\000\000\001 additional: d.ns.nic.cz 18000 A 193.29.206.1 additional: d.ns.nic.cz 18000 28 \040\001\006x\000\001\000\000\000\000\000\000\000\000\000\001
$ dnsq soa cz c.ns.nic.cz
6 cz: 138 bytes, 1+1+4+0 records, response, authoritative, noerror query: 6 cz answer: cz 18000 SOA a.ns.nic.cz hostmaster.nic.cz 1444799399 900 300 604800 900 authority: cz 18000 NS b.ns.nic.cz authority: cz 18000 NS d.ns.nic.cz authority: cz 18000 NS a.ns.nic.cz authority: cz 18000 NS c.ns.nic.cz
だが、これをみると、子ゾーンとしては扱われてはいないようだ。 -- ToshinoriMaeno 2015-10-14 06:40:54
[plan] plan 'podpora.nic.cz.' type 'A' [resl] => querying: '193.29.206.1' score: 174 zone cut: 'cz.' m12n: 'NIC.cz.' type: 'NS' [iter] <= rcode: NOERROR [iter] <= found cut, retrying with non-minimized name [resl] => querying: '193.29.206.1' score: 159 zone cut: 'cz.' m12n: 'pODPOra.NIc.Cz.' type: 'A' [iter] <= rcode: NOERROR [resl] finished: 4, queries: 1, mempool: 16392 B