Using a CNAME in my reverse zone

[Kevin Darcy]

When someone does a reverse lookup, the type of record they query is PTR.
A CNAME just "redirects" the query to some other name. So is there a PTR record
owned by the "my.isp.hostname" name (if you had used the real name, maybe I could
have figured this out myself)? If not, then the reverse query will get "No such
host". The maintainer of the zone containing "my.isp.hostname" needs to add a
PTR record, or, alternatively, you should change that CNAME to point elsewhere.
Folks usually like to keep their forward and reverse zones separate, so maybe your
ISP already has a "reverse" zone where they maintain miscellaneous PTRs like this.


- Kevin

G. Roderick Singleton wrote:

> I would like to establish a reverse record for my primary zone. One
> problem, my hosting nameserver must live within my ISP's namespace.
> So can I have a reverse zone e.g.
> zone "68.67.112.24.IN-ADDR.ARPA" {
>         type master;
>         file "rev.24";
> };
> where rev.24 contains
> @       IN SOA          realdomain.net. root.realdomain.net. (
>                         1998012301      ; serial
>                         3600    ; refresh every hour
>                         3600    ; retry after 1 hour
>                         360000  ; expire after 100 hours
>                         3600    ; default ttl is 1 hour
>                         )
>         IN NS           realdomain.net.
>         IN NS           ns2.realdomain.net.
> ;
> ; realdomain hosts
> ;
> 68       IN CNAME          my.isp.hostname.
>
> my.isp.hostname is in the isp's reverse maps.  My nameservers are
> external to my environment and my local nameserver is a slave to these.
>
> Can I do this without breaking anything?
> --
> ________________________________________________________________________________
> G. Roderick Singleton, <gsingleton at home.com> PATH tech,
> 71 Underhill Drive, Unit 159, Toronto, ON  M3A 2J8
> Voice : 416-452-4583 Fax: 416-452-0036 Toll Free: 1-888-354-PATH
> ________________________________________________________________________________
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