watchNS/ashikaga.co.jp/case2について、ここに記述してください。
キャッシュが空の状態で、NSを問い合わせると、こんなことも起きる。
$ dig -t ns ashikaga.co.jp @127.0.0.3
; <<>> DiG 9.11.1 <<>> -t ns ashikaga.co.jp @127.0.0.3 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49757 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ; COOKIE: bd0651655bdd628c49b4e577590099ea7ef5db6ff20d89d9 (good) ;; QUESTION SECTION: ;ashikaga.co.jp. IN NS ;; ANSWER SECTION: ashikaga.co.jp. 86400 IN NS ns.ashikaga.co.jp. ;; Query time: 207 msec ;; SERVER: 127.0.0.3#53(127.0.0.3) ;; WHEN: Wed Apr 26 22:00:26 JST 2017 ;; MSG SIZE rcvd: 88
1. kresd log
[system] interactive mode > [ 0][plan] plan 'ashikaga.co.jp.' type 'NS' [34781][iter] 'ashikaga.co.jp.' type 'NS' id was assigned, parent id 0 [34781][resl] => using root hints [64555][iter] 'ashikaga.co.jp.' type 'NS' id was assigned, parent id 0 [64555][resl] => querying: '202.12.27.33' score: 10 zone cut: '.' m12n: 'jp.' type: 'NS' proto: 'udp' [64555][iter] <= using glue for 'b.dns.jp.': '202.12.30.131' [64555][iter] <= using glue for 'd.dns.jp.': '210.138.175.244' [64555][iter] <= using glue for 'e.dns.jp.': '192.50.43.53' [64555][iter] <= using glue for 'g.dns.jp.': '203.119.40.1' [64555][iter] <= using glue for 'f.dns.jp.': '150.100.6.8' [64555][iter] <= using glue for 'h.dns.jp.': '65.22.40.25' [64555][iter] <= using glue for 'a.dns.jp.': '203.119.1.1' [64555][iter] <= using glue for 'c.dns.jp.': '156.154.100.5' [64555][iter] <= referral response, follow [64555][resl] <= server: '202.12.27.33' rtt: 7 ms [ 4227][iter] 'ashikaga.co.jp.' type 'NS' id was assigned, parent id 0 [ 4227][resl] => querying: '65.22.40.25' score: 10 zone cut: 'jp.' m12n: 'cO.jP.' type: 'NS' proto: 'udp' [ 4227][iter] <= rcode: NOERROR [ 4227][iter] <= found cut, retrying with non-minimized name [ 4227][ pc ] => answer cached for TTL=900 [ 4227][resl] <= server: '65.22.40.25' rtt: 170 ms [56772][iter] 'ashikaga.co.jp.' type 'NS' id was assigned, parent id 0 [56772][resl] => querying: '203.119.40.1' score: 10 zone cut: 'jp.' m12n: 'ASHIkaga.Co.jp.' type: 'NS' proto: 'udp' [56772][iter] <= using glue for 'ns.ashikaga.co.jp.': '133.242.85.115' [56772][iter] <= referral response, follow [56772][resl] <= server: '203.119.40.1' rtt: 6 ms [28635][iter] 'ashikaga.co.jp.' type 'NS' id was assigned, parent id 0 [28635][resl] => querying: '133.242.85.115' score: 10 zone cut: 'ashikaga.co.jp.' m12n: 'AshIKaGA.CO.Jp.' type: 'NS' proto: 'udp' [28635][iter] <= rcode: NOERROR [28635][resl] <= server: '133.242.85.115' rtt: 22 ms [ 0][resl] finished: 4, queries: 1, mempool: 32800 B
- NSがひとつしか登録されていないサーバーに問い合わせているので、当然だ。