## page was renamed from DNS/用語/PublicDNS/8.8.8.8/togetter ## page was renamed from DNS/PublicDNS/8.8.8.8/togetter ## page was renamed from DNS/キャッシュサーバ/8.8.8.8/togetter ## page was renamed from DNS/watch/8.8.8.8/togetter DNS/watch/8.8.8.8/togetterについて、ここに記述してください。 8.8.8.8 の毒が消えた。-- ToshinoriMaeno <> google DNS キャッシュがクリアされたらしい。（旧サーバは古い返事を続けている。） %dig any togetter.com @8.8.8.8 {{{ ; <<>> DiG 9.6.2-P2 <<>> any togetter.com @8.8.8.8 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40818 ;; flags: qr rd ra; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;togetter.com. IN ANY ;; ANSWER SECTION: togetter.com. 86400 IN NS ns-93.awsdns-11.com. togetter.com. 86400 IN NS ns-657.awsdns-18.net. togetter.com. 86400 IN NS ns-1461.awsdns-54.org. togetter.com. 86400 IN NS ns-1828.awsdns-36.co.uk. togetter.com. 900 IN SOA ns-1461.awsdns-54.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400 togetter.com. 60 IN A 46.51.250.145 togetter.com. 600 IN TXT "v=spf1 +a +mx +include:gmail.com ~all" togetter.com. 600 IN TXT "google-site-verification=SI0ODkRbg4-YeTmDnwJlfSgCM4Alg1rxkfafZzqzvhI" ;; Query time: 136 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Fri Jul 8 07:35:52 2011 ;; MSG SIZE rcvd: 374 }}} ------ 8.8.8.8 には キャッシュサーバとして問い合わせるべきだった。 $ DNSCACHEIP=8.8.8.8 dnsqr any togetter.com {{{ 255 togetter.com: 184 bytes, 1+4+0+0 records, response, noerror query: 255 togetter.com answer: togetter.com 473 CNAME togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com answer: togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com 60 SOA ns-944.amazon.com root.amazon.com 1310025024 3600 900 7776000 60 answer: togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com 600 NS ns-944.amazon.com answer: togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com 60 A 46.51.250.145 }}} ---- $ DNSCACHEIP=8.8.8.8 dnsqr ns togetter.com {{{ 2 togetter.com: 127 bytes, 1+2+0+0 records, response, noerror query: 2 togetter.com answer: togetter.com 1783 CNAME togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com answer: togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com 70 NS ns-925.amazon.com }}} NSレコードは教えてくれない。　（CNAMEを優先するらしい） ----- CNAMEのTTL の変わり方が変 (ほぼ休みなく問い合わせた） 以下は8.8.8.8 がコンテンツサーバだとしての問い合わせなので、答が変でもしかたないのかも。 $ dnsq a togetter.com 8.8.8.8 {{{ 1 togetter.com: 115 bytes, 1+2+0+0 records, response, weird ra, noerror query: 1 togetter.com answer: togetter.com 1757 CNAME togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com answer: togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com 17 A 46.51.250.145 }}} tmaeno@:~$ dnsq any togetter.com 8.8.8.8 {{{ 255 togetter.com: 30 bytes, 1+0+0+0 records, response, weird ra, noerror query: 255 togetter.com }}} tmaeno@:~$ dnsq a togetter.com 8.8.8.8 {{{ 1 togetter.com: 115 bytes, 1+2+0+0 records, response, weird ra, noerror query: 1 togetter.com answer: togetter.com 1744 CNAME togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com answer: togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com 4 A 46.51.250.145 }}} tmaeno@:~$ dnsq ns togetter.com 8.8.8.8 {{{ 2 togetter.com: 30 bytes, 1+0+0+0 records, response, weird ra, noerror query: 2 togetter.com }}} tmaeno@:~$ dnsq a togetter.com 8.8.8.8 {{{ 1 togetter.com: 115 bytes, 1+2+0+0 records, response, weird ra, noerror query: 1 togetter.com answer: togetter.com 1208 CNAME togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com answer: togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com 56 A 46.51.250.145 }}}