finding authoritative nameservers
Niall O'Reilly
Niall.oReilly at ucd.ie
Mon May 19 09:20:38 UTC 2008
On 18 May 2008, at 21:18, Ronald F. Guilmette wrote:
> I've tried all sorts of things, in my abundant ignorance, and nothing
> seems to work entirely reliably 100% of the time. (Maybe its just
> an impossible goal?)
Nothing will, if there are ill-configured firewalls or other
obstacles in the way. That apart, you can take avoid coding
by using a well-know tool.
% dig +trace domain-of-interest-here ns
For example:
dhcp-189(niall)4: dig +trace ucd.ie ns
; <<>> DiG 9.3.4 <<>> +trace ucd.ie ns
;; global options: printcmd
. 437919 IN NS G.ROOT-SERVERS.NET.
. 437919 IN NS B.ROOT-SERVERS.NET.
. 437919 IN NS I.ROOT-SERVERS.NET.
. 437919 IN NS A.ROOT-SERVERS.NET.
. 437919 IN NS E.ROOT-SERVERS.NET.
. 437919 IN NS H.ROOT-SERVERS.NET.
. 437919 IN NS F.ROOT-SERVERS.NET.
. 437919 IN NS M.ROOT-SERVERS.NET.
. 437919 IN NS D.ROOT-SERVERS.NET.
. 437919 IN NS J.ROOT-SERVERS.NET.
. 437919 IN NS L.ROOT-SERVERS.NET.
. 437919 IN NS K.ROOT-SERVERS.NET.
. 437919 IN NS C.ROOT-SERVERS.NET.
;; Received 492 bytes from 137.43.116.19#53(137.43.116.19) in 42 ms
ie. 172800 IN NS NS2.NIC.FR.
ie. 172800 IN NS ICE.NETSOURCE.ie.
ie. 172800 IN NS GNS2.DOMAINREGISTRY.ie.
ie. 172800 IN NS UUCP-GW-2.PA.DEC.COM.
ie. 172800 IN NS UUCP-GW-1.PA.DEC.COM.
ie. 172800 IN NS NS3.NS.ESAT.NET.
ie. 172800 IN NS NS-IE.RIPE.NET.
ie. 172800 IN NS BANBA.DOMAINREGISTRY.ie.
ie. 172800 IN NS B.IEDR.ie.
ie. 172800 IN NS GNS1.DOMAINREGISTRY.ie.
;; Received 498 bytes from 192.112.36.4#53(G.ROOT-SERVERS.NET) in 151 ms
ucd.ie. 172800 IN NS ns1.tcd.ie.
ucd.ie. 172800 IN NS scsnms.switch.ch.
ucd.ie. 172800 IN NS auth-ns1.ucd.ie.
ucd.ie. 172800 IN NS auth-ns2.ucd.ie.
ucd.ie. 172800 IN NS uucp-gw-1.pa.dec.com.
ucd.ie. 172800 IN NS uucp-gw-2.pa.dec.com.
;; Received 284 bytes from 2001:660:3005:1::1:2#53(NS2.NIC.FR) in 36 ms
ucd.ie. 86400 IN NS scsnms.switch.ch.
ucd.ie. 86400 IN NS auth-ns1.ucd.ie.
ucd.ie. 86400 IN NS auth-ns2.ucd.ie.
ucd.ie. 86400 IN NS uucp-gw-1.pa.dec.com.
ucd.ie. 86400 IN NS uucp-gw-2.pa.dec.com.
ucd.ie. 86400 IN NS ns1.tcd.ie.
;; Received 376 bytes from 134.226.1.114#53(ns1.tcd.ie) in 6 ms
dhcp-189(niall)5:
Best regards,
Niall O'Reilly
University College Dublin IT Services
PGP key ID: AE995ED9 (see www.pgp.net)
Fingerprint: 23DC C6DE 8874 2432 2BE0 3905 7987 E48D AE99 5ED9
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