I tried to make a DNS trace request (taking Oxford's website www.ox.ac.uk
as an example) starting from Google's DNS 8.8.8.8
. I can successfully get the result and the route was via the country level DNS nsa.nic.uk
.
However, when I tried to ask nsa.nic.uk
directly, there is no route shown. Is that normal and why didn't it show the result?
Thanks in advance!
Command 1 (asking Googld DNS):-
$ dig +trace www.ox.ac.uk @8.8.8.8
Command 1 Result (get route successfully):-
8.8.8.8
(Google DNS)
-> 192.203.230.10
(e.root-servers.net
)
-> 156.154.100.3
(nsa.nic.uk
)
-> 193.62.157.66
(ns4.ja.net
)
-> 193.63.105.17
(ns2.ja.net
)
-> 129.67.242.155
(www.ox.ac.uk
)
Command 2 (asking nsa.nic.uk
directly):-
$ dig +trace www.ox.ac.uk @156.154.100.3
Command 2 Result (get no route):-
Received 28 bytes from 156.154.100.3#53(156.154.100.3) in 79 ms