] On Wed, 3 Dec 2003 09:48 pm, Kim Davies wrote:
] > | So any domain registry that offers nameservice for it's client is
] > | actually a better option than the client hosting their own name
] > | servers within their own domain ?
] > |
] > | So for our foobar.com.au domain it would be better NOT to use
] > | ns1.foobar.com.au etc as our primary/secondary nameservers ?
] >
] > It is a matter of religion whether it is good or bad, but the fact is
] > you will have to notify the parent zone if you renumber and use glue.

In the case of foobar.com.au where all the official DNS servers are under
foobar.com.au, to notify the parent zone in a case of renumbering, you
would only need to notify the auDA Accredited Registrar for foobar.com.au.

] Is there a technique using dig to determine if we do or do not
] have a glue record in place, and whether that is something I
] need to specifically deal with or not ?

dig §server host.dom.ain.
where "server" is the place you want to check and "host.dom.ain"
is the glue record you are looking for.

If there is glue on that server, there would be an answer section
with something like
	ns1.foobar.com.au.	2D	IN	A	....

If there is no answer section, but an authority section like this:
	;; AUTHORITY SECTION:
	.                       172800  IN      NS      b.root-servers.net.
	.                       172800  IN      NS      k.root-servers.net.
	.                       172800  IN      NS      d.root-servers.net.
	.                       172800  IN      NS      j.root-servers.net.
	...
then there is no glue for that host on that server.

For example,
	dig §a.gtld-servers.net ns1.foobar.com.au.
	dig §b.gtld-servers.net ns1.foobar.com.au.
	...
	dig §m.gtld-servers.net ns1.foobar.com.au.

	dig §a.gtld.biz ns1.foobar.com.au.
	dig §b.gtld.biz ns1.foobar.com.au.
	...
	dig §f.gtld.biz ns1.foobar.com.au.

	dig §tld1.ultradns.net. ns1.foobar.com.au.
	dig §tld2.ultradns.net. ns1.foobar.com.au.

gtld-servers.net has the .com and .net DNS servers.
gtld.biz has the .biz DNS servers.
ultradns.net has the .org DNS servers.

Since the glue is coming from a zone file (eg the "com" zone), you should
be able to ask any of the DNS servers for that zone and get the same result
(glue or no glue).

So querying:
	dig §a.gtld-servers.net ns1.foobar.com.au.
	dig §a.gtld.biz ns1.foobar.com.au.
	dig §tld1.ultradns.net. ns1.foobar.com.au.
is probably sufficient.

___________________________________________________________________________
 David Keegel <djk&#167;cybersource.com.au>  http://www.cyber.com.au/users/djk/
 Cybersource P/L: Linux/Unix Systems Administration Consulting/Contracting