multiple PTR RRs [dnsviz]
Joseph S D Yao
jsdy at tux.org
Thu Jun 3 01:50:07 UTC 2010
On Wed, Jun 02, 2010 at 03:40:31PM +0000, Paul Vixie wrote:
> Chris Thompson <cet1 at cam.ac.uk> writes:
>
> > Nothing that I can see. Maybe dnsviz can't cope with multiple PTR
> > records in an RRset, as your first case has? (On the other hand it
> > handles multiple A records in forward zones OK.)
>
> to be fair, multiple PTR RRs is something we added in BIND gethostbyaddr()
> in more or less direct contravention to RFC 1034. if dnsviz doesn't handle
> it (and i don't know if it doesn't) then it's not dnsviz's fault at all
> since the DNS RFC's say that there will only be one PTR RR at an in-addr.
Vixie, not to presume to argue with you about what Paul M meant by that,
but in RFC 2181 Elz and Bush say:
10.2. PTR records
Confusion about canonical names has lead to a belief that a PTR
record should have exactly one RR in its RRSet. This is incorrect,
the relevant section of RFC1034 (section 3.6.2) indicates that the
value of a PTR record should be a canonical name. That is, it should
not be an alias. There is no implication in that section that only
one PTR record is permitted for a name. No such restriction should
be inferred.
That having been said, I always feel better, myself, when there is a
1-to-1 mapping.
--
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** Joe Yao jsdy at tux.org - Joseph S. D. Yao
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