classless subnet??

Kevin Darcy kcd at daimlerchrysler.com
Thu Oct 5 22:11:23 UTC 2000


If you want to manage the reverse lookup data for your address range, then for
each address in your range, your ISP will need to either

a) Delegate it as a separate zone to your nameservers

or

b) Create an alias (CNAME) pointing to some name in a zone you control

See RFC 2317 for general information on option (b).

Regardless of which option is chosen, you should probably arrange to become a
slave of the /24 reverse zone (31.b.a.in-addr.arpa), so that you'll be able to
reverse-resolve your own names, even if you lose connectivity to your ISP.


- Kevin

Alan Macaluso wrote:

> I have the following network assigned to me by my ISP:
>
> Network routed: a.b.31.232/29
> Router address: a.b.31.233
> Netmask: 255.255.255.248
>
> Available IP addresses: a.b.31.234 - a.b.31.238
>
> I'm running BIND 8.2.2 and I have a test network configured properly
> with forward/reverse lookups that seem to work properly.
>
> Some of what I've been reading indicates a problem with the reverse
> lookups with DNS running on a 'classless subnet' of this size.  DNS &
> BIND (O'Reilly) however seems not to mention this problem.  Before I
> throw the switch, is this issue for real and how do I get around it (if
> I can!)?
>
> Please CC me in response as I do not lurk here often.
>
> Much thanks to you all!
>
> --
> A l a n  M a c a l u s o                        +   212.473.1773 nyc
> Media-Technica Inc 295 E 8th Street NYC 10009   +   917.797.6802 mobile
> http://www.media-technica.com                   +   alan at media-technica.com






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