MoinQ:

1. DNS/glue/unbound 1.9.1

Contents

  1. DNS/glue/unbound 1.9.1
  2. flush_zone
  3. com NS
  4. +norec

Unboundがsibling domain glue返答を受け入れていないことまでは分かる。-- ToshinoriMaeno 2019-04-01 13:22:05

同様のテストをbindでもやってみよう。../bind-9.14.0

net nsを問合せて、unboundがどこまで調べているかも、見ておこう。-- ToshinoriMaeno 2019-04-01 13:38:57

/net

2. flush_zone

$ unbound-control flush_zone net
$ unbound-control flush_zone com

3. com NS

$ dig -t ns com

; <<>> DiG 9.14.0 <<>> -t ns com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59721
;; flags: qr rd ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1220
;; QUESTION SECTION:
;com.                           IN      NS

;; ANSWER SECTION:
com.                    172800  IN      NS      k.gtld-servers.net.
com.                    172800  IN      NS      d.gtld-servers.net.
com.                    172800  IN      NS      l.gtld-servers.net.
com.                    172800  IN      NS      h.gtld-servers.net.
com.                    172800  IN      NS      e.gtld-servers.net.
com.                    172800  IN      NS      f.gtld-servers.net.
com.                    172800  IN      NS      g.gtld-servers.net.
com.                    172800  IN      NS      a.gtld-servers.net.
com.                    172800  IN      NS      i.gtld-servers.net.
com.                    172800  IN      NS      m.gtld-servers.net.
com.                    172800  IN      NS      b.gtld-servers.net.
com.                    172800  IN      NS      j.gtld-servers.net.
com.                    172800  IN      NS      c.gtld-servers.net.

;; Query time: 64 msec
;; SERVER: 127.0.0.3#53(127.0.0.3)
;; WHEN: 月  4月 01 22:16:49 JST 2019
;; MSG SIZE  rcvd: 256

4. +norec

なにがキャッシュにあるかを調べる。 

$ dig +norec -t ns net
...

$ dig +norec -t ns nstld.com

; <<>> DiG 9.14.0 <<>> +norec -t ns nstld.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21002
;; flags: qr ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1220
;; QUESTION SECTION:
;nstld.com.                     IN      NS

;; ANSWER SECTION:
nstld.com.              86285   IN      NS      av4.nstld.com.
nstld.com.              86285   IN      NS      av2.nstld.com.
nstld.com.              86285   IN      NS      av3.nstld.com.
nstld.com.              86285   IN      NS      av1.nstld.com.

;; Query time: 0 msec
;; SERVER: 127.0.0.3#53(127.0.0.3)
;; WHEN: 月  4月 01 22:18:44 JST 2019
;; MSG SIZE  rcvd: 110