1. 不当なNXDOMAIN返答
Contents
Empty Non Terminal (ENT) を問い合わせたときにNXDOMAINを返してくる問題がある。
;; WHEN: Wed Mar 22 16:49:24 JST 2023
mailer17.emailfd.nprod.nicovideo.jp を調べてみよ。DNS/RFC/8020
- mailer17.emailfd.nprod.nicovideo.jp. 300 IN A 133.152.33.28
nicovideo.jp ゾーンには問題はない。問題はawsdnsの動作にある。-- ToshinoriMaeno 2021-03-23 03:26:29
ENT に対して、NXDOMAIN 返答をする。
2. whois
[Domain Name] NICOVIDEO.JP [Registrant] Dwango co., Ltd. [Name Server] ns-161.awsdns-20.com [Name Server] ns-2041.awsdns-63.co.uk [Name Server] ns-1169.awsdns-18.org [Name Server] ns-788.awsdns-34.net [Signing Key] [Created on] 2006/12/05 [Expires on] 2021/12/31 [Status] Active [Last Updated] 2021/01/01 01:05:10 (JST)
3. history
$ dig emailfd.nprod.nicovideo.jp @ns-161.awsdns-20.com
; <<>> DiG 9.11.3-1ubuntu1.12-Ubuntu <<>> emailfd.nprod.nicovideo.jp @ns-161.awsdns-20.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 37336
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; NSID: 38 65 64 61 32 63 35 31 38 30 38 30 32 61 62 65 64 65 34 32 35 38 37 32 65 30 62 38 65 39 61 64 20 20 2d ("8eda2c5180802abede425872e0b8e9ad -")
;; QUESTION SECTION:
;emailfd.nprod.nicovideo.jp. IN A
;; AUTHORITY SECTION:
nicovideo.jp. 300 IN SOA ns-161.awsdns-20.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 300
;; Query time: 50 msec
;; SERVER: 205.251.192.161#53(205.251.192.161)
;; WHEN: Tue Mar 23 12:24:22 JST 2021
;; MSG SIZE rcvd: 175
4. mailer17
$ dig mailer17.emailfd.nprod.nicovideo.jp @ns-161.awsdns-20.com
; <<>> DiG 9.16.1-Ubuntu <<>> mailer17.emailfd.nprod.nicovideo.jp @ns-161.awsdns-20.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16098
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; NSID: 31 32 64 62 65 62 61 39 38 38 36 66 65 66 33 37 66 35 31 31 66 31 32 39 64 38 35 33 30 32 31 36 20 20 2d ("12dbeba9886fef37f511f129d8530216 -")
;; QUESTION SECTION:
;mailer17.emailfd.nprod.nicovideo.jp. IN A
;; ANSWER SECTION:
mailer17.emailfd.nprod.nicovideo.jp. 300 IN A 133.152.33.28
;; AUTHORITY SECTION:
nicovideo.jp. 300 IN NS ns-1169.awsdns-18.org.
nicovideo.jp. 300 IN NS ns-161.awsdns-20.com.
nicovideo.jp. 300 IN NS ns-2041.awsdns-63.co.uk.
nicovideo.jp. 300 IN NS ns-788.awsdns-34.net.
;; Query time: 115 msec
;; SERVER: 205.251.192.161#53(205.251.192.161)
;; WHEN: 火 4月 06 17:41:38 JST 2021
;; MSG SIZE rcvd: 259