DNS/amazonawsについて、ここに記述してください。

[[/2019-08]]

www.chukyo-u.ac.jpがqname minimisation採用時にnxdomain返答を受け取るという話
  クレームしたら、elb.amazonaws.comにTXTレコードが追加されたとのこと。
　[[watchWWW/chukyo-u.ac.jp]] 


ENTに対して、noerror返答をするかどうかの確認をしてみた。
-- ToshinoriMaeno <<DateTime(2017-12-18T21:06:02+0900)>>

resolverにNXDOMAIN返答して不都合だと言われたelb.amazonaws.comに(だけ)はTXTレコードを追加したらしい。
-- ToshinoriMaeno <<DateTime(2017-12-18T21:07:32+0900)>>

-----


ec2-54-215-197-164.us-west-1.compute.amazonaws.com

ec2-54-215-197-164.us-west-1.compute.amazonaws.com. 604800 IN A	54.215.197.164

%dig -t ns us-west-1.compute.amazonaws.com @a.gtld-servers.net
{{{
; <<>> DiG 9.11.2 <<>> -t ns us-west-1.compute.amazonaws.com @a.gtld-servers.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24622
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 5
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;us-west-1.compute.amazonaws.com. IN	NS

;; 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.

;; ADDITIONAL SECTION:
u1.amazonaws.com.	172800	IN	A	156.154.64.10
u2.amazonaws.com.	172800	IN	A	156.154.65.10
r1.amazonaws.com.	172800	IN	A	205.251.192.27
r2.amazonaws.com.	172800	IN	A	205.251.195.199

;; Query time: 122 msec
;; SERVER: 192.5.6.30#53(192.5.6.30)
;; WHEN: Mon Dec 18 20:40:16 JST 2017
;; MSG SIZE  rcvd: 192
}}}


%dig -t ns compute.amazonaws.com @u1.amazonaws.com.           ~/dnsq/1120
{{{
; <<>> DiG 9.11.2 <<>> -t ns compute.amazonaws.com @u1.amazonaws.com.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31192
;; 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: 65235
;; QUESTION SECTION:
;compute.amazonaws.com.		IN	NS

;; AUTHORITY SECTION:
amazonaws.com.		3593	IN	SOA	pdns1.ultradns.net. hostmaster.amazon.com. 2014061556 180 60 2592000 3593

;; Query time: 10 msec
;; SERVER: 156.154.64.10#53(156.154.64.10)
;; WHEN: Mon Dec 18 20:41:43 JST 2017
;; MSG SIZE  rcvd: 122
}}}
20:41f%dig -t ns compute.amazonaws.com @r1.amazonaws.com.           ~/dnsq/1120
{{{
; <<>> DiG 9.11.2 <<>> -t ns compute.amazonaws.com @r1.amazonaws.com.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 34688
;; 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
;; QUESTION SECTION:
;compute.amazonaws.com.		IN	NS

;; AUTHORITY SECTION:
amazonaws.com.		3593	IN	SOA	dns-external-master.amazon.com. hostmaster.amazon.com. 2012708585 180 60 2592000 3593

;; Query time: 155 msec
;; SERVER: 205.251.192.27#53(205.251.192.27)
;; WHEN: Mon Dec 18 20:41:49 JST 2017
;; MSG SIZE  rcvd: 124
}}}