IPv6 rDNS - how will it be done?

Wed Apr 28 09:02:56 UTC 2010

Hi!

In some internal DNS applications, I've missed the so useful pipe feature of
the sendmail alias (user: | /script), I mean, being able to forward a DNS
request to a script that returns the resolution response. Maybe
something similar would be useful in this IPv6 rDNS scenario too. Does
anyone of you know if there's any chance to direct a zone to a script
instead of to a file?

Regards,
David.

-----------------------

Message: 1
Date: 28 Apr 2010 01:46:57 -0000
From: John Levine <johnl at iecc.com>
Subject: Re: [Nanog] Re: IPv6 rDNS - how will it be done?
To: nanog at nanog.org
Message-ID: <20100428014657.91479.qmail at joyce.lan>
Content-Type: text/plain; charset=iso-8859-1

>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.

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

R's,
John