Parent is a CNAME

Joseph S D Yao jsdy at
Wed Dec 2 18:53:19 UTC 2009

On Wed, Dec 02, 2009 at 12:52:01PM -0500, Barry Margolin wrote:
> I think he misunderstood you to be saying that the name that has a CNAME 
> can never appear on the *righthand* side of a RR.  This is true for 
> records like MX and NS -- they mustn't point to aliases.  CNAME chains 
> are the exception to this rule.

And actually, names that are on the left-hand side of a CNAME record can
also appear on the left-hand side of certain DNSSEC records.

I don't think there's a similar general rule about right-hand sides,
just - as you say - the specific rules against use in RHS of MX and NS.
Which, unfortunately, does not prevent their use in many cases ...

** Joe Yao				jsdy at - Joseph S. D. Yao

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