How to do I do reverse on a Supernet?

[Berislav Todorovic]

In article <Pine.OSF.3.96.990721132916.5303K-100000 at firma.thezone.net>,
  "Roderick B. Greening" <roderick at cableatlantic.nf.ca> wrote:
> But RFC 2317 does not cover shorter prefixes like /23, /22, or /21?

For prefixes shorter than /24, but lonter than /16 you can:

* Create a separate subdomain for each /24 ("class C" subnet), or
* Directly write PTRs in the reverse zone for the whole /16 block.

The latter method is more painful, but with BIND 8.2.1 it doesn't have
to be, if your hosts use automatically generated names (you can use
$GENERATE). Example:

$ORIGIN 16.172.in-addr.arpa.

; --- 172.16.0/23 - separate subdomain method

0   IN   NS   ns1.mydomain.com.
    IN   NS   ns2.mydomain.com.
1   IN   NS   ns1.mydomain.com.
    IN   NS   ns2.mydomain.com.

; --- 172.16.4/22 - direct PTR records method

$GENERATE 1-254 $.4 IN   PTR   dial4-$.mydomain.com.
$GENERATE 1-254 $.5 IN   PTR   dial5-$.mydomain.com.
$GENERATE 1-254 $.6 IN   PTR   dial6-$.mydomain.com.
$GENERATE 1-254 $.7 IN   PTR   dial7-$.mydomain.com.

Regards,
Beri



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