address-to-names
Hongbo Shi
shi at goto.info.waseda.ac.jp
Sat Oct 14 01:08:05 UTC 2000
Dear all,
I have thought about the PTR RR for long time.
I still not quite sure why PTR RR is based on the "one IP one domain"
consideration in [RFC1034].
I hope somebody can answer this question for me.
[RFC1034]
cname & aliases:
"Most of these systems have a notion that one of the equivalent set of
names is the canonical or primary name and all others are aliases."
PTR:
"Domain names in RRs which point at another name should always point at
the primary name and not the alias. This avoids extra indirections in
accessing information."
Furthermore a lot of persons regard the domain name used in the A record
as a cname. Is it correct? Is it misunderstanding? Is there some new RFCs
already permitted the consideration?
And then based on the cosideration above, if the following A records exist,
A.ISI.EDU IN A 10.0.0.52
B.ISI.EDU IN A 10.0.0.52
C.ISI.EDU IN A 10.0.0.52
of course "address-to-names" should exist.
52.0.0.10.IN-ADDR.ARPA IN PTR A.ISI.EDU
52.0.0.10.IN-ADDR.ARPA IN PTR B.ISI.EDU
52.0.0.10.IN-ADDR.ARPA IN PTR C.ISI.EDU
%[RFC1034] didn't describe that a name used in A record should be regarded
as a cname, as far as I know.
Best Regards
Hongbo Shi
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