Technical Summary
Many sites connected to the Internet make use of IPv4 addresses
that are not globally unique. Examples are the addresses
designated in RFC 1918 for private use within individual sites.
Devices in such environments may occasionally originate Domain
Name System (DNS) queries (so-called "reverse lookups") corresponding
to those private-use addresses. Since the addresses concerned
have only local significance, it is good practice for site
administrators to ensure that such queries are answered locally.
However, it is not uncommon for such queries to follow the normal
delegation path in the public DNS instead of being answered
within the site.
It is not possible for public DNS servers to give useful answers
to such queries. In addition, due to the wide deployment of
private-use addresses and the continuing growth of the Internet,
the volume of such queries is large and growing. The AS112
project aims to provide a distributed sink for such queries in
order to reduce the load on the IN-ADDR.ARPA authoritative
servers. The AS112 project is named after the Autonomous System
Number (ASN) that was assigned to it.
The AS112 project does not accommodate the addition and removal
of DNS zones elegantly. Since additional zones of definitively
local significance are known to exist, this presents a problem.
This document describes modifications to the deployment and use
of AS112 infrastructure that will allow zones to be added and
dropped much more easily.
Working Group Summary
There were no notable outcomes from the WG process or in the
working-group last call. The dnsop working group chair observed
strong consensus on the text and the approach described by the
text following presentations and discussion on the mailing list
and in multiple in-person meetings.
Document Quality
The document describes the use of protocols that are already
defined and implemented to augment AS112 infrastructure. The
approach was validated by experiment, and an abridged summary
of that experiment and its results are included in the document.
The Acknowledgements section of the diagram does not omit to
mention any significant reviewer.
The working group review included input from participants with
significant DNS protocol and operations expertise, and in the
opinion of this document shepherd and the working group chairs
no additional expert consultation is required.
Personnel
The document shepherd is Tim Wicinski.
The dnsop working group chairs are Tim Wicinski and Suzanne
Woolf.
The responsible area director is Joel Jaeggli.