1. NXDOMAIN (ENT)
Contents
1.1. whois
;; AUTHORITY SECTION: amazonaws.com. 172800 IN NS u1.amazonaws.com. amazonaws.com. 172800 IN NS u2.amazonaws.com. amazonaws.com. 172800 IN NS r1.amazonaws.com. amazonaws.com. 172800 IN NS r2.amazonaws.com.
u[12] の返事は普通だが、r[12]の返事がおかしいらしい。
1.2. ENT nxdomain
$ dig -t a compute.amazonaws.com @r1.amazonaws.com
; <<>> DiG 9.11.3-1ubuntu1.14-Ubuntu <<>> -t a compute.amazonaws.com @r1.amazonaws.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 56128
;; 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:
;compute.amazonaws.com. IN A
;; AUTHORITY SECTION:
amazonaws.com. 3593 IN SOA dns-external-master.amazon.com. hostmaster.amazon.com. 2012708585 180 60 2592000 3593
;; Query time: 50 msec
;; SERVER: 205.251.192.27#53(205.251.192.27)
;; WHEN: Mon Sep 27 10:30:06 JST 2021
;; MSG SIZE rcvd: 163