digによるドメイン名解決のトレース

Tool

$ dig +trace [ドメイン名] で、検索の途中経過を表示させることができる。
例）dig +trace www.google.co.jp
(このときの経路＝ L.ROOT-SERVERS.NET→a.dns.jp→ns3.google.com)

; <<>> DiG 9.2.1 <<>> +trace www.google.co.jp
;; global options: printcmd
. 179119 IN NS L.ROOT-SERVERS.NET.
. 179119 IN NS M.ROOT-SERVERS.NET.
. 179119 IN NS A.ROOT-SERVERS.NET.
. 179119 IN NS B.ROOT-SERVERS.NET.
. 179119 IN NS C.ROOT-SERVERS.NET.
. 179119 IN NS D.ROOT-SERVERS.NET.
. 179119 IN NS E.ROOT-SERVERS.NET.
. 179119 IN NS F.ROOT-SERVERS.NET.
. 179119 IN NS G.ROOT-SERVERS.NET.
. 179119 IN NS H.ROOT-SERVERS.NET.
. 179119 IN NS I.ROOT-SERVERS.NET.
. 179119 IN NS J.ROOT-SERVERS.NET.
. 179119 IN NS K.ROOT-SERVERS.NET.
;; Received 244 bytes from 127.0.0.1#53(127.0.0.1) in 2 ms

jp. 172800 IN NS a.dns.jp.
jp. 172800 IN NS b.dns.jp.
jp. 172800 IN NS d.dns.jp.
jp. 172800 IN NS e.dns.jp.
jp. 172800 IN NS f.dns.jp.
;; Received 310 bytes from 198.32.64.12#53(L.ROOT-SERVERS.NET) in 160 ms

google.co.jp. 86400 IN NS ns3.google.com.
google.co.jp. 86400 IN NS ns4.google.com.
google.co.jp. 86400 IN NS ns1.google.com.
google.co.jp. 86400 IN NS ns2.google.com.
;; Received 116 bytes from 203.119.1.1#53(a.dns.jp) in 41 ms

www.google.co.jp. 345600 IN CNAME www.google.com.
www.google.com. 604800 IN CNAME www.l.google.com.
l.google.com. 86400 IN NS a.l.google.com.
l.google.com. 86400 IN NS b.l.google.com.
l.google.com. 86400 IN NS c.l.google.com.
l.google.com. 86400 IN NS d.l.google.com.
l.google.com. 86400 IN NS e.l.google.com.
l.google.com. 86400 IN NS f.l.google.com.
l.google.com. 86400 IN NS g.l.google.com.
;; Received 306 bytes from 216.239.36.10#53(ns3.google.com) in 211 ms


MEMO(53902)