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List:       namedroppers
Subject:    Re: DNAME [4.13]: PTR Records and DNAME
From:       Mark Andrews <Mark_Andrews () isc ! org>
Date:       2006-10-13 0:33:02
Message-ID: 200610130033.k9D0X2ta091983 () drugs ! dv ! isc ! org
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> Issue [4.13]:
>    PTR records in the reverse zone must have canonical names as their
>    RDATA, like NS and MX records.  The lookup process for PTR records
>    owner names may involve DNAME/CNAME records, but the lookup process
>    for PTR records RDATA names may not.  RFC 1912.  More problematic
>    than NS and MX in operational sense, since the reverse zone may not
>    be under the control of the zone operator.
> 
> Like issue [4.4]. So DNAME'd domains are not allowed on the right hand
> side of PTR records.

	PTR records can point to any name regardless of the types at that
	name or even if it exist.  PTR records are described as being
	similar to CNAME records but are not followed RFC103?.  CNAME
	records can (though it is discouraged) point to CNAME records.

	From a operational point of view DNAME does not change any
	requirement to point to a canonical name.  A name under a DNAME
	is not canonical.
 
> Best regards,
>    Wouter
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