1. watchA

3台中の1台だけがTCP接続に返答をする。

$ dig +tcp ns1.dreamhost.com @208.97.182.10

; <<>> DiG 9.12.1 <<>> +tcp ns1.dreamhost.com @208.97.182.10
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51250
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;ns1.dreamhost.com.             IN      A

;; ANSWER SECTION:
ns1.dreamhost.com.      300     IN      A       64.90.62.230

;; Query time: 343 msec
;; SERVER: 208.97.182.10#53(208.97.182.10)
;; WHEN: Tue Apr 24 20:35:47 JST 2018
;; MSG SIZE  rcvd: 51

$ dig +tcp ns1.dreamhost.com @64.90.62.230
;; Connection to 64.90.62.230#53(64.90.62.230) for ns1.dreamhost.com failed: timed out.

tmaeno@u16:~$ dig +tcp ns3.dreamhost.com @66.33.205.230
;; Connection to 66.33.205.230#53(66.33.205.230) for ns3.dreamhost.com failed: timed out.

$ dig +tcp -t ns dreamhost.com @208.97.182.10

; <<>> DiG 9.12.1 <<>> +tcp -t ns dreamhost.com @208.97.182.10
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43454
;; flags: qr aa rd; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 3
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;dreamhost.com.                 IN      NS

;; ANSWER SECTION:
dreamhost.com.          14400   IN      NS      ns1.dreamhost.com.
dreamhost.com.          14400   IN      NS      ns2.dreamhost.com.
dreamhost.com.          14400   IN      NS      ns3.dreamhost.com.

;; ADDITIONAL SECTION:
ns1.dreamhost.com.      300     IN      A       64.90.62.230
ns2.dreamhost.com.      300     IN      A       208.97.182.10
ns3.dreamhost.com.      300     IN      A       66.33.205.230

;; Query time: 336 msec
;; SERVER: 208.97.182.10#53(208.97.182.10)
;; WHEN: Tue Apr 24 20:38:13 JST 2018
;; MSG SIZE  rcvd: 133

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