1. GoogleCache/togetter.com
について、ここに記述してください。
いつまでCNAMEを答えつづけるだろうか。 永続的浸透問題？ DNS/watch/togetter.com など
- togetter.com の古い設定を答えるサーバが残っているかぎり、治らないのかも。
キャッシュがクリアされた模様。（古いサーバは返事を続けていることから推測） -- ToshinoriMaeno 2011-07-07 22:47:20
浸透問題はいつまでも解決しないのか。
$ dig a togetter.com @8.8.8.8
; <<>> DiG 9.7.3 <<>> a togetter.com @8.8.8.8 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10476 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;togetter.com. IN A ;; ANSWER SECTION: togetter.com. 367 IN CNAME togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com. togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com. 18 IN A 46.51.250.145 ;; Query time: 87 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Thu Jul 7 17:22:43 2011 ;; MSG SIZE rcvd: 115
1.1. NS
$ dig ns togetter.com @8.8.8.8
; <<>> DiG 9.7.3 <<>> ns togetter.com @8.8.8.8 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6050 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;togetter.com. IN NS ;; ANSWER SECTION: togetter.com. 1 IN CNAME togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com. togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com. 518 IN NS ns-947.amazon.com. ;; Query time: 71 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Thu Jul 7 18:58:55 2011 ;; MSG SIZE rcvd: 127
tmaeno@:~$ dig ns togetter.com @8.8.8.8
; <<>> DiG 9.7.3 <<>> ns togetter.com @8.8.8.8 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12992 ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;togetter.com. IN NS ;; ANSWER SECTION: togetter.com. 3600 IN NS dns1.name-services.com. togetter.com. 3600 IN NS dns2.name-services.com. togetter.com. 3600 IN NS dns3.name-services.com. togetter.com. 3600 IN NS dns4.name-services.com. togetter.com. 3600 IN NS dns5.name-services.com. ;; Query time: 276 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Thu Jul 7 18:58:56 2011 ;; MSG SIZE rcvd: 139
NSとCNAMEとがともにキャッシュされている状況ではCNAMEを優先して答えるらしい。-- ToshinoriMaeno 2011-07-07 10:08:18
CNAMEのTTLが残っているのに、問い合わせるとTTLが増えるのはなぜか。
1.2. name-services.com
$ dig a togetter.com @dns1.name-services.com
; <<>> DiG 9.7.3 <<>> a togetter.com @dns1.name-services.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 65300 ;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;togetter.com. IN A ;; ANSWER SECTION: togetter.com. 1800 IN CNAME togetter-outer-1482106848.ap-northeast-1.elb.amazonaws.com. ;; Query time: 223 msec ;; SERVER: 98.124.192.1#53(98.124.192.1) ;; WHEN: Thu Jul 7 19:02:06 2011 ;; MSG SIZE rcvd: 99