[Ietf-not43] #6 inetDnsDomain objects and 2251 referrals

[Eric A. Hall]

on 8/18/2003 4:51 PM Andrew Newton wrote:

> Is that how LDAP clients normally handle labeledURI syntax?

It's the prescribed behavior.

> Then why do have the following text:
> 
>       DNS domain name entries in FIRS MUST use the inetDnsDomain object
>       class, in addition to the mandatory object classes defined in
>       [FIRS-CORE]. DNS domain name entries MUST be treated as containers
>       capable of holding subordinate entries. If an entry exists as a
>       referral source, the entry MUST also be defined with the referral
>       object class, in addition to the above requirements.
> 
> Why would they also use the referral objectclass?

It's either-or, not also. The referrals are for use whenever a domain
entry needs to exist as an alias for some other entry.

An easy example is when www.example.com is really a set of web pages
hosted by an isp. In that case, a query for the www.example.com domain
entry would just return a referral to host.example.net.

Another example that we discussed recently would be variants for i18n
domain names, where all of the variants exist as entries but only exist as
referral entries. This allows a query for a variant to match the right
entry, and still get shunted off to the canonical entry.

-- 
Eric A. Hall                                        http://www.ehsco.com/
Internet Core Protocols          http://www.oreilly.com/catalog/coreprot/