Jun 162013
How to trace DNS from the root servers
Answer:
Use the command `dig`, e.g.
dig +trace mit.edu
;; global options: +cmd
. 19927 IN NS d.root-servers.net.
. 19927 IN NS e.root-servers.net.
. 19927 IN NS m.root-servers.net.
. 19927 IN NS l.root-servers.net.
. 19927 IN NS a.root-servers.net.
. 19927 IN NS k.root-servers.net.
. 19927 IN NS f.root-servers.net.
. 19927 IN NS j.root-servers.net.
. 19927 IN NS b.root-servers.net.
. 19927 IN NS h.root-servers.net.
. 19927 IN NS g.root-servers.net.
. 19927 IN NS i.root-servers.net.
. 19927 IN NS c.root-servers.net.
;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 12 ms
edu. 172800 IN NS a.edu-servers.net.
edu. 172800 IN NS c.edu-servers.net.
edu. 172800 IN NS d.edu-servers.net.
edu. 172800 IN NS f.edu-servers.net.
edu. 172800 IN NS g.edu-servers.net.
edu. 172800 IN NS l.edu-servers.net.
;; Received 260 bytes from 199.7.83.42#53(199.7.83.42) in 223 ms
mit.edu. 172800 IN NS usw2.akam.net.
mit.edu. 172800 IN NS asia1.akam.net.
mit.edu. 172800 IN NS asia2.akam.net.
mit.edu. 172800 IN NS use2.akam.net.
mit.edu. 172800 IN NS ns1-37.akam.net.
mit.edu. 172800 IN NS ns1-173.akam.net.
mit.edu. 172800 IN NS eur5.akam.net.
mit.edu. 172800 IN NS use5.akam.net.
;; Received 404 bytes from 192.31.80.30#53(192.31.80.30) in 548 ms
mit.edu. 20 IN A 23.46.134.151
;; Received 41 bytes from 63.150.131.81#53(63.150.131.81) in 4 ms