接続元により動作を変えているらしい。
家からだと通常の問い合わせも一度は timed out になっている。
conoha VPS からだと、一度 timed out のあと、返事をする。
- 13399 ftc.go.kr. May 27 00:00:01 - May 27 12:55:30
1. whois
Domain Name : ftc.go.kr Registrant : Fair Trade Commission Registrant Zip Code : 30timed out108 Administrative Contact(AC) : Fair Trade Commission AC E-Mail : basici@korea.kr AC Phone Number : 044-200-4279 Registered Date : 1996. 12. 30. Last Updated Date : 2020. 12. 17. Expiration Date : 2025. 10. 15. Publishes : Y Authorized Agency : Inames Co., Ltd.(http://www.inames.co.kr) DNSSEC : unsigned Primary Name Server Host Name : ns.gcc.go.kr IP Address : 152.99.1.10 Secondary Name Server Host Name : ns2.gcc.go.kr IP Address : 152.99.200.6
2. history
$ dig -t ns ftc.go.kr @152.99.1.10 ;; communications error to 152.99.1.10#53: timed out ;; communications error to 152.99.1.10#53: timed out ; <<>> DiG 9.18.12-0ubuntu0.22.04.1-Ubuntu <<>> -t ns ftc.go.kr @152.99.1.10 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6299 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 2048 ; COOKIE: 337292def3c3c125010000006469635d42486518e9d977dc (good) ;; QUESTION SECTION: ;ftc.go.kr. IN NS ;; ANSWER SECTION: ftc.go.kr. 600 IN NS ns.gcc.go.kr. ftc.go.kr. 600 IN NS ns2.gcc.go.kr. ;; ADDITIONAL SECTION: ns.gcc.go.kr. 1988 IN A 152.99.1.10 ns2.gcc.go.kr. 1988 IN A 152.99.200.6 ;; Query time: 36 msec ;; SERVER: 152.99.1.10#53(152.99.1.10) (UDP) ;; WHEN: Sun May 21 09:18:37 JST 2023 ;; MSG SIZE rcvd: 142 $ dig -t ns ftc.go.kr @152.99.200.6 ;; communications error to 152.99.200.6#53: timed out ; <<>> DiG 9.18.12-0ubuntu0.22.04.1-Ubuntu <<>> -t ns ftc.go.kr @152.99.200.6 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17474 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 3 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 2048 ; COOKIE: 012c83107099818b0100000064696385cf33c6a9c48d3134 (good) ;; QUESTION SECTION: ;ftc.go.kr. IN NS ;; ANSWER SECTION: ftc.go.kr. 600 IN NS ns2.gcc.go.kr. ftc.go.kr. 600 IN NS ns.gcc.go.kr. ;; ADDITIONAL SECTION: ns.gcc.go.kr. 1948 IN A 152.99.1.10 ns2.gcc.go.kr. 1948 IN A 152.99.200.6 ;; Query time: 40 msec ;; SERVER: 152.99.200.6#53(152.99.200.6) (UDP) ;; WHEN: Sun May 21 09:19:17 JST 2023 ;; MSG SIZE rcvd: 142 $ dig -t a 00001111.ftc.go.kr @152.99.200.6 ;; communications error to 152.99.200.6#53: timed out ;; communications error to 152.99.200.6#53: timed out ;; communications error to 152.99.200.6#53: timed out ; <<>> DiG 9.18.12-0ubuntu0.22.04.1-Ubuntu <<>> -t a 00001111.ftc.go.kr @152.99.200.6 ;; global options: +cmd ;; no servers could be reached 152.99.1.10 $ dig -t a 00001111.ftc.go.kr @152.99.1.10 ;; communications error to 152.99.1.10#53: timed out ;; communications error to 152.99.1.10#53: timed out ;; communications error to 152.99.1.10#53: timed out ; <<>> DiG 9.18.12-0ubuntu0.22.04.1-Ubuntu <<>> -t a 00001111.ftc.go.kr @152.99.1.10 ;; global options: +cmd ;; no servers could be reached