Classless in-addr.arpa delegation.

[Jay Nugent]

Greetings,

On Mon, 28 Aug 2000, Kevin Darcy wrote:

> 
> Doing RFC 2317 on a non-bit-boundary is a little unusual, but certainly
> workable.  That's why I say that "classless delegation" is somewhat of a
> misnomer -- it's really *aliasing* rather than "delegation" _per_se_.
> All your ISP needs to do is add 10 CNAMEs to the
> 192.204.212.in-addr.arpa zone: 
> 
> 51    in    cname    51.rev.jdimedia.nl.
> 52    in    cname    52.rev.jdimedia.nl.
> 53    in    cname    53.rev.jdimedia.nl.
> (etc.)
> 
> I've used "rev.jdimedi.nl" here as the "container" zone for the PTR
> records, but you could use *anything* mutually-acceptable between your
> and your ISP, as long as it's a zone delegated to, and controlled by
> you. 

   Or just have the ISP do the following which will send all PTR lookups
to YOUR nameserver.  Then on your nameserver you use conventional PTR
records to do the final resolve.

At the ISP:
-----------
51    IN     NS     ns1.yourserver.com.
52    IN     NS     ns1.yourserver.com.
53    IN     NS     ns1.yourserver.com.


In your nameserver:
-------------------
51    IN     PTR    larry.yourdomain.com.
52    IN     PTR    moe.yourdomain.com.
53    IN     PTR    curley.yourdomain.com.


   I do this for my 128-host address block.  My ISP didn't even know it
could be done.  They learn something new from their customers every day
  :-)

      --- Jay

             /~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~/~~\
            |  Jay Nugent                 jjn at nuge.com |____|
            |  Nugent Telecommunications  www.nuge.com |
            |  Web-Pegasus          www.webpegasus.com |
            |  (734)971-1076        (734)971-4529 /Fax |
            |                                          |
            | ISP & Modem Performance Monitoring Svcs. |
            | Discount Reseller of 123.Net ISP Services|
            | Internet Consulting / Linux SysAdmin     |
            | Web Hosting / DNS Hosting / Shell Accts. |
            | Embedded Controllers / Engr. & Design    |
         /~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~/   |
         \_________________________________________\__/

  6:00pm  up 110 days, 7 min,  6 users,  load average: 0.00, 0.00, 0.00