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Old 13th October 2010, 11:41 PM
555 555 is offline
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IETF Meeting in Beijing

Dear colleagues,

At the moment, we have a very light agenda for the Beijing meeting.
These are the items for which we've received requests:

1. A brief presentation on a DNSSEC history wiki (with a solitication
for participation).

2. A discussion of draft-vixie-dnsext-resimprove-00.

*3. A discussion of draft-yao-dnsext-identical-resolution-0[1|2].

* From:

From the above draft:

3. Possible Solutions

Currently, there are several possible mechanisms to support identical
DNS resolution of "bundled" or "variant" names as "aliases" in the
DNS. Existing mechanisms in the DNS include CNAME and DNAME. In
addition, as described briefly above, registry operators have a great
many techniques for applying policy to what names can be registered,
and provisioning technology to how they are instantiated in the DNS,
in support of keeping "variant" names behaving similarly to each
other, or in preventing the use of such variants as might be
considered confusing or dangerous.

In addition, there are new proposals for DNS protocol to support
"aliases" in the DNS as part of the desired behavior of "variant"
names: Names direction[BNAME], and "Zone clone".

All of the solutions have their advantages and disadvantages. In
particular, there are a couple of limitations they all share. Every
mechanism existing or proposed to support "aliases" in the DNS
requires that one name be designated as the "canonical" name
("preferred" in the terminology of the JET variant mechanism) and any
others bundled with it are to be considered "variants" or "aliases".
The only known way to enforce a symmetrical or equivalent association
is via careful registry provisioning within and across domains. In
addition, the different "alias" mechanisms differ in subtle ways that
have to be carefully reviewed against the desired behavior of the DNS
in support of different types of "variants".

3.1. Mapping or Redirection of Domain Names

3.1.1. Mapping itself

It was recognized as part of the original specification of the DNS
that a host can have many names; in fact this expectation predates
the DNS, referring to the earlier specification of host names. In
the simplest case for "aliases", Internet users need these multiple
names to be resolved to the same IP address by a DNS server. The
CNAME record [RFC1034], where "CNAME" is an abbreviation for
"Canonical Name", is a way to designate aliases of the "real" or
canonical name of a host. In some cases, CNAME can be used to
produce the necessary association a bundle of variant domain names.
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