Reverse zone delegation for - HOW TO?

Doug Barton dougb at
Sat May 19 23:58:37 UTC 2012

On 5/18/2012 9:29 AM, Ellad G. Yatsko wrote:
> Hello!
> There is the Supernet is distributed through my network.
> Some network hierarchy is built in this Supernet. Some addressing plan
> is used.
> There are some towns. Each town has IP pool of
> There are some sites in different districts of above towns, they get a
> block of IP-addresess: 172.xx.0.0/20 from its main town's server.
> Indeed it's no matter what and why. Now I want to build hierarchic
> structure of DNS servers in each location. And delegate zones accordingly.
> But I have some troubles in the beginning. How do I describe topmost
> zone?

You don't set up the /12 zone at all.

You haven't made it clear what the relationships are between the sites,
and who needs to resolve what. You also haven't made clear where the
resolving name servers are for these sites. In order to help we really
need more information about what you're trying to accomplish.

> I used a trick and made zone It is not exact but it
> works.

You really don't want to do that.

> But I can't at all to delegate block to second level
> server to say nothing about delegation from second level
> to ending DNS!

You probably don't want to delegate them at all, you probably want to
just set up the /16 zones on the appropriate local server. If other
sites need to resolve the addresses for a /16 assigned to one city,
there are various ways that this can be accomplished, but as I said
above we need to know more about what you're trying to do.

For delegation of the /20 zones, see:

    If you're never wrong, you're not trying hard enough

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