[Nanog] Re: IPv6 rDNS - how will it be done?

David Conrad drc at virtualized.org
Tue Apr 27 21:13:47 CDT 2010

On Apr 27, 2010, at 6:46 PM, John Levine wrote:

>> Hmm. A macro expansion for a /48 would mean
>> 1,208,925,819,614,629,174,706,176 leaves. An interesting stress test
>> for name servers... :-).
> My inclination would be to use a wildcard that returns something like
> not-in-service.some-network.net, and let the clients add records for
> the addresses they use.

While better than 1 septillion zone entries, you still have the problem of how to let the clients add the records.  DDNS is one approach.  Manual intervention (e.g., as part of a customer provisioning system) is another as long as you don't use privacy extensions.

> For spoof resistance, how about doing a forward lookup on the
> purported name and only installing it if it gets a matching AAAA
> record?

Sounds like a reasonable DDNS filtering approach.


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