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From: e07@nikhefh.nikhef.nl (Eric Wassenaar)
Newsgroups: comp.protocols.tcp-ip.domains
Subject: Is a glue record required here ?
Message-ID: <1210@nikhefh.nikhef.nl>
Date: 18 Apr 91 19:54:28 GMT
Sender: e07@nikhef.nl (Eric Wassenaar)
Organization: Nikhef-H, Amsterdam (the Netherlands).
Lines: 33


Suppose this is the zone data file at 'host1.foo.bar'

$ORIGIN foo.bar.
@		IN	SOA	...
		IN	NS	host1.foo.bar.
host1		IN	A	....
host2		IN	A	....

sub2		IN	NS	host2.foo.bar.

sub1		IN	NS	host3.sub2.foo.bar.

The question is here whether or not to add a glue record for
'host3.sub2.foo.bar' on behalf of subsequent queries such as
'host4.sub1.foo.bar'.
In principle, after a few iterations, the nameserver would
be able to figure out the address of host3 himself, so that
a glue record would not be absolutely necessary.
But will he actually carry out these iterations ??
If he does, adding the glue record would save such steps.

Is a glue record for host3 in this case
a. absolutely necessary
b. redundant but a time-saving handy shortcut
c. plainly wrong

Eric Wassenaar
-- 
Organization: NIKHEF-H, National Institute for Nuclear and High-Energy Physics
Address: Kruislaan 409, P.O. Box 41882, 1009 DB Amsterdam, the Netherlands
Phone: +31 20 592 0412, Home: +31 20 6909449, Telefax: +31 20 592 5155
Internet: e07@nikhef.nl