dig <domain> ns fails when local name servers misconfigured

[Mark Andrews]

In message <D7186502-B0C7-442C-809A-F3FEC289A734 at ilap.com>, Tristan Goguen writ
es:
> 
> Hi all,
> 
> We have been using dig to retrieve a domain's name servers for years.  
> Unfortunately, the dig syntax we normally use does not work when name  
> servers are misconfigured. Currently, dig is returning an empty name  
> server list for domain ilap.ca:
> 
>      dig +short ilap.ca ns
>          < empty list >
> 
> For testing purposes, we removed the zone statement for the domain.
> 
> We would like to take some action when domain authority transfers take  
> place. Can we configure dig to return the name server list based  
> exclusively on a query to the root / TLD servers? Can local name  
> servers be ignored?

"dig +noall +norec +authority zone @parent" should return you the referral.

e.g.
	dig +noall +authority +norec ilap.ca @sns-pb.isc.org

Also it is bad form to turn off the service before the re-delegation
has taken place and the old NS/A/AAAA/DS/DNSKEY records have expired
from caches.  The old servers should be slaves of the new servers.
This allows for a smooth transition to occur.

Mark

> Thank you for any advice.
> 
> Regards,
> Tristan
> 
> -
> Tristan Goguen
> CEO, ILAP(r)
> 
> (416) 250-5600 x205   -   tgoguen at ilap.com
> 
> Our mission is to provide the North American marketplace with advanced  
> Internet solutions.
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org