Technical Summary
This memo clarifies how to set the RCODE and how to handle the AD
and AA bits when processing chains of CNAMEs, DNAMEs, or any other
similar (as yet uninvented) RRTYPE that performs name redirection.
It addresses an ambiguity that has persisted in handling of these
RRTYPEs since RFC 1034 was published.
Working Group Summary
This memo was reviewed by five reviewers of the DNS Extensions
Working Group. It agrees with other discussions on the DNSEXT
mailing list about how to handle these cases.
Document Quality
The memo agrees with the actual behaviour of many deployed DNS
resolvers.
Personnel
Andrew Sullivan <ajs@anvilwalrusden.com> is the Document
Shepherd. Ralph Droms <rdroms.ietf@gmail.com> is the
Responsible AD.
RFC Editor Note
Please edit the headers for this document to reflect that
it updates RFC1035, RFC2672, and RFC2308.
Please make the following edits before publication:
Rename Section 2:
OLD
2. Status Bits
NEW
2. Restatement of Status Bits and What They Mean
Extend text is first part of Section 2:
OLD
relate to the first, possible intermediate, and/or last queries, as
follows:
NEW
relate to the first, possible intermediate, and/or last queries, as
below. Note that the following is unchanged from RFC 1035 and RFC
4035. The meaning of these bits is simply restated here for
clarity, because of observations of released implementations that
did not follow these meanings.