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A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : A DNS RR for Pointers to RRs outside class IN
Author(s) : T. Hardie
Filename : draft-hardie-out-rr-00.txt
Date : 13-Jun-02
The Domain Name System is a global distributed lookup system with
delegation. In the original specification of the DNS [RFC 1035],
CLASSes were described as parallel data structures within a single
namespace but with potentially different delegations of authority.
[BCP 42] defines a different vision, in which different CLASSes
represent fundamentally different namespaces. Though [BCP 42]
includes procedures for assignment of CLASSes, there has been
little use of this axis of extensibility; in practice, CLASS IN is
the only widely deployed CLASS in the DNS. The ubiquity of CLASS
IN for name to IP address mapping has caused a vicious cycle in
which extensions are placed within that CLASS to take advantage of
its global deployment, with each addition further increasing its
gravitational attraction. This document describes a Resource
Record for use within CLASS IN that contains a pointer to a CLASS
outside of IN. This mechanism is intended to allow administrators
to indicate that a named resource identified within CLASS IN is
also present in a different namespace, potentially under a different
name. This cross-class pointer will allow the DNS to handle
new namespaces with mechanisms appropriate to those namespaces
while providing a connection to the globally deployed CLASS IN
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