Reverse IPv6

[Woodworth, John R]

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> From: bind-users [mailto:bind-users-bounces at lists.isc.org] On Behalf Of Bob Harold
> Sent: Friday, February 03, 2017 4:15 PM
> To: Cathy Almond
> Cc: bind-users at lists.isc.org
> Subject: Re: Reverse IPv6
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> On Thu, Feb 2, 2017 at 5:44 AM, Cathy Almond <cathya at isc.org> wrote:
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> On 02/02/2017 02:52, Filho Arrais wrote:
> > Hi,
> >
> > Hello,
> > Excuse me the question, is there anything native to IPv6 like in IPv4
> > for PTR input?
> >
> > $GENERATE 1-254 $  PTR   100.200.236.$.examplae.com <http://examplae.com>.
> >
> > --
>

Hi Filho,

Apologies such a delayed response.  I am one of the authors of the mentioned
draft (BULK RRs).  We are still moving this through its paces and are hopeful
it will eventually become a standard.  One advantage for IPv6 use of our draft
is the minimal memory footprint for storing the necessary "tons" of
$GENERATE-like RRs.

I have made a note of your email address and will contact you once our
solution gets adopted and/ or has working implementations.


Best regards,
John

>
> Bear in mind that that reverse populating your IPv6 space in entirety is
> potentially going to hurt you (the $GENERATE command actually generates
> an RR for each record which will be held in the zone in memory).  Think
> about how many records your $GENERATE is going to create.  You don't
> want to have named failing to start because it does not have enough
> memory (or the machine on which it is running does not have enough
> memory) to hold all of the PTR RRsets in the zone.
>
> Please also think about whether you need to do this or not, especially
> as the names are going to follow a generic pattern and not provide any
> useful intelligence about the host using that address.
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> Instead, I would suggest that you just create PTR entries for the IPv6
> hosts that actually need them for some reason, or to use dynamic DNS to
> add/replace/delete them as addresses are used/discarded by dynamic clients.
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> Note that there is future work being done to solve the 'too many entries'
> issue with GENERATE (does not solve the other concerns):
> https://www.ietf.org/internet-drafts/draft-woodworth-bulk-rr-03.txt
>
> --
> Bob Harold
>
>
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