PTR record for CNAME

[Barry Margolin]

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.