PTRs for IPv6 (was Re: [SHAME] Spam Rats)

Lee Howard Lee at
Thu Jan 10 15:23:15 UTC 2013

RE: PTRs for IPv6, see
I've had many excellent suggestions for updates to it, which I intend to
treat in the next couple of weeks.  I don¹t cover PTRs for servers,
because I don't see a scalability problem.
However, I don't think I understand the conversation below.  Pointers to
make me smarter?


On 1/10/13 1:22 AM, "Mark Andrews" <marka at> wrote:

>In message <alpine.BSF.2.00.1301100106560.55043 at joyce.lan>, "John R.
>Levine" wr
>> >> One is a stunt rDNS server that synthesizes the records on demand.
>> >> (Bonus points for doing DNSSEC, too. Double bonus points for doing
>> >> NSEC3.)
>> >
>> > NSEC3 is a waste of time in or any similarly structured
>> > zone so -1000000 for doing NEC3 and effectively doing a DoS attack
>> > against yourself and the client resolvers.
>> I know, but figuring out on the fly what order the hashes are would
>> be quite a coding feat.
>subtract labels until you have one which fits the namespace pattern.
>that is the closest encloser <ce>. hash that name for the closest
>encloser.  hash <label>.<ce> add/subtact one for the second half
>of the noqname proof.  hash *.<ce> add/subtact one for the no
>wildcard proof.
>> R's,
>> John
>Mark Andrews, ISC
>1 Seymour St., Dundas Valley, NSW 2117, Australia
>PHONE: +61 2 9871 4742                 INTERNET: marka at

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