On 16 Oct 2009, at 19:14, Alfred HÎnes wrote:
2.3. DNAME Apex not Redirected itself
Unlike a CNAME RR, a DNAME RR redirects DNS names subordinate to its
owner name; the owner name of a DNAME is not redirected itself. The
domain name that owns a DNAME record is allowed to have other
resource record types at that domain name, except DNAMEs, CNAMEs or
other types that have restrictions on what they can co-exist with.
|> DNAME RRs are not allowed at the parent side of a delegation point
|> but are allowed at a zone apex.
What this says is that if you use a DNAME at the parent it must
replace the delegation. It does not say that the DNAME can't be in the
parent.
The real issue that needs attention here is an operational one: the
extra load at the root servers derived from the need to do CNAME
synthesis for a percentage of the queries. This has a provisioning
side which would be good to quantify and an implementation efficiency
side, which could be addressed by ICANN throwing money at implementers
to optimise that part if DNAME is the choice for IDN variant
implementation at the root.
Joao
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