PTR record for CNAME
Barry Margolin
barmar at bbnplanet.com
Fri Jan 7 23:28:05 UTC 2000
In article <387661ab.78634984 at news.intelenet.net>,
WAKA <news at walknet.net> wrote:
>Is there a way to create a reverse lookup for both the CNAME and the
>actual name ?
No. The DNS specification specifically states that PTR records must point
to canonical names, not aliases.
>Example:
>
> actual-name IN A actual-address.
> aliased-name IN CNAME actual-name.
>
> actual-addrerss.IN-ADDR.ARPA. IN PTR actual-name.
> actual-addrerss.IN-ADDR.ARPA. IN PTR aliased-name.
>
>When a reverse lookup is performed on the actual-name it works
>(because its listed first, I assume), but on the CNAME it doesn't.
>This makes sence since I can't have ambigious information in the
>records, but is there a way to have both names available to a reverse
>lookup ?
What do you mean by "reverse lookup is performed on the actual-name".
Reverse lookups are performed on IP addresses, not names.
If you perform a reverse lookup of that address, you should get *both* PTR
records. If you're only getting one PTR record back, something is wrong
with the tool you're using. DIG, NSLOOKUP, and HOST will all show both of
them.
--
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.
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