How to do I do reverse on a Supernet?

[Michael Voight]

It makes no difference if you use DDTS. We do it with our product, and
it is possible to follow RFC 2317. The worst part is creating a CNAME
record for all of the addresses in the subnet. All other records are
created automatically. 

Step 1. Create a CNAME record for every address you are using.
(Say the subnet mask is 255.255.255.128)

1.1.1.1.in-addr.arpa.  in cname 1.1.1.1.myarpa1.
1.1.1.129.in-addr.arpa. in cname 1.1.1.129.myarpa2.

(note the zone name change from myarpa1 to myarpa2)

Step 2. Create the PTR records in the myarpa1 and myarpa2 domains

1.1.1.1.myarpa. in PTR  bob.mydomain.com.

(of course, create the zones first)

Michael
 

"Roderick B. Greening" wrote:
> 
> Here's the real problem that I neglected to meantion... we're doing DDNS
> on the /21, /22, and /23 blocks. Any suggestions on how to accomplish this
> and set up the in-addr zone's so that we can have them dynamically updated
> while the remaining /24 zones are manually configured?
> 
> On Wed, 21 Jul 1999, Michael Voight wrote:
> 
> > Yes, this is documented in DNS and Bind. (I think all editions of the
> > book)
> > It is also documented in RFC 2317
> >
> > Michael Voight
> > CSE, Cisco TAC
> >
> > "Roderick B. Greening" wrote:
> > >
> > > I have a block of addresses, which in classful routing are all class C
> > > (/24) addresses. I have the entire /16 block, and have left some as /24,
> > > but others I have supernetted as /23, /22, and /21.
> > >
> > > Forward DNS is easy, but the reverse is a little more difficult. Currently
> > > all my reverse is only done for the /24's and are all in seperate zone
> > > files.
> > >
> > > Is there a way to put the /23, /22, and /21's into seperate zone files?
> > >
> > > Thanks in advance.
> > >
> > > Roderick B. Greening, BSc.      |
> > > Network Specialist              | roderick at cableatlantic.nf.ca
> > > Cable Atlantic Inc.             |
> >
> 
> Roderick B. Greening, BSc.      |
> Network Specialist              | roderick at cableatlantic.nf.ca
> Cable Atlantic Inc.             |