automatic reverse and forwarding zones
Grant Taylor
gtaylor at tnetconsulting.net
Thu Oct 27 15:52:55 UTC 2022
On 10/27/22 1:16 AM, Marco Moock wrote:
> Hello,
Hi,
> how do ISPs automatically create the reverse and forwaring zones for
> their customers IP pools?
I think it might be out of scope for what you were asking about, but I
believe the following is an alternative approach.
> For example one of their clients has the IP 2001:db::3.
So for clarity, we're talking about 2001:db:0:0:0:0:0:3. (I think. I'm
on my first cup of coffee.)
This is a singular IP (presumably link-net) for a customer. So there
would be exactly one forward AAAA and one reverse PTR record.
I remember years ago that DHCP servers could be configured to
dynamically update the forward and / or reverse zone when providing a
lease to a client.
With this in mind, the forward and reverse zones would be roughly the
size of the number of customers thus not blossoming ~> exploding into
something that is tantamount to a DoS.
> Its reverse zone
> 3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.b.d.0.0.1.0.0.2.ip6.arpa
> includes a PTR pointing to
> 3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.b.d.0.0.1.0.0.2.isp.example.org
>
> This has an AAAA record of 2001:db::3.
>
> Is it possible to let bind create that automatically for certain zones?
Aside from $GENERATE, which others have talked about exploding the zone,
I'm not aware of any way to have BIND /initiate/ the change to zone
content / data (for this).
--
Grant. . . .
unix || die
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