9.4.1 and delegation-only zones

[Mark Andrews]

> I'm trying to understand how a delegation only zone is different from have the
> option "delegation-only" in a zone.  That is, whats different from this:
> 
> zone zone_name [class] {
> 	type delegation-only;
> };

	This enforces delegation only without the potential to 
	to change where you get answers from.
 
> and these next three:
> 
> zone zone_name [class] {
> 	type hint;
> 	[ delegation-only yes_or_no ; ]
> };
> 
> zone zone_name [class] {
> 	type stub;
> 	[ delegation-only yes_or_no ; ]
> };
> 
> zone zone_name [class] {
> 	type forward;
> 	[ delegation-only yes_or_no ; ]
> };

	These enforces delegation only and allow you to change
	where you get the answers from.

	Think of it this way.  delegation-only puts the zone
	name in a seperate table that says that there must be
	a delegation in the tree between any records (excludes NS
	RRSIG NS, NSEC, DS) and the zone.

	Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org