DNS/TCP/facebook.com/a.ns.c10r.facebook.comについて、ここに記述してください。

TCPで問い合わせるとおかしい。([[/2]])

{{{
$ dig a.ns.c10r.facebook.com @69.171.239.11

; <<>> DiG 9.12.1 <<>> a.ns.c10r.facebook.com @69.171.239.11
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51789
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 4
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;a.ns.c10r.facebook.com.		IN	A

;; ANSWER SECTION:
a.ns.c10r.facebook.com.	3600	IN	A	69.171.239.11

;; AUTHORITY SECTION:
c10r.facebook.com.	3600	IN	NS	a.ns.c10r.facebook.com.
c10r.facebook.com.	3600	IN	NS	b.ns.c10r.facebook.com.

;; ADDITIONAL SECTION:
a.ns.c10r.facebook.com.	3600	IN	AAAA	2a03:2880:fffe:b:face:b00c:0:99
b.ns.c10r.facebook.com.	3600	IN	AAAA	2a03:2880:ffff:b:face:b00c:0:99
b.ns.c10r.facebook.com.	3600	IN	A	69.171.255.11

;; Query time: 34 msec
;; SERVER: 69.171.239.11#53(69.171.239.11)
;; WHEN: Sun Apr 22 13:35:34 JST 2018
;; MSG SIZE  rcvd: 169


}}}

== qname minimisation ==
{{{
$ dig -t ns ns.c10r.facebook.com @69.171.239.11

; <<>> DiG 9.12.1 <<>> -t ns ns.c10r.facebook.com @69.171.239.11
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 21249
;; 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: 512
;; QUESTION SECTION:
;ns.c10r.facebook.com.		IN	NS

;; AUTHORITY SECTION:
c10r.facebook.com.	300	IN	SOA	a.ns.c10r.facebook.com. dns.facebook.com. 1524372537 300 600 600 300

;; Query time: 34 msec
;; SERVER: 69.171.239.11#53(69.171.239.11)
;; WHEN: Sun Apr 22 13:53:06 JST 2018
;; MSG SIZE  rcvd: 91

}}}

{{{
	qname-minimisation: yes
}}}