[92998] in North American Network Operators' Group
Re: Need help explaining in-addr.arpa to Limelight
daemon@ATHENA.MIT.EDU (Joseph S D Yao)
Mon Oct 23 22:43:50 2006
Date: Mon, 23 Oct 2006 22:43:35 -0400
From: Joseph S D Yao <jsdy@center.osis.gov>
To: Edward Lewis <Ed.Lewis@neustar.biz>
Cc: nanog@merit.edu
Mail-Followup-To: Edward Lewis <Ed.Lewis@neustar.biz>, nanog@merit.edu
In-Reply-To: <a06230902c16317d4cf39@[192.168.1.101]>
Errors-To: owner-nanog@merit.edu
On Mon, Oct 23, 2006 at 09:13:03PM -0400, Edward Lewis wrote:
>
> At 18:48 -0400 10/23/06, Joseph S D Yao wrote:
>
> >No, because in fact you can. There is nothing magic about an
> >in-addr.arpa domain.
>
> I'd say there is some magic. Possibly.
There are conventions. There is RFC 2317. There is no magic. ;-)
You can have subdomains neustar.16.154.156.in-addr.arpa and
lewis.0.127.in-addr.arpa. You can have a pointer at
456.24.154.156.in-addr.arpa, much good it will do you.
The "magic" in reverse DNS is keeping it aligned properly with forward
DNS according to all the conventions we've established, including RFC
2317 - which, OBTW, explicitly allows for non-standard subdomains used
in reverse DNS. How about 158.16.neustar.com? ;-)
> If an admin were granted the authority for a /25 worth of space, then
> you can't just delegate that part of the in-addr.arpa domain. That's
> the RFC Joe Abley cited.
>
> A /24 can be delegated (assuming we are talking about 255 addresses,
> from .0 to .255). Perhaps, and this is weak speculation, the ISP in
> question is not used to SWIPing /24 and has an institutional policy
> of using RFC 2317 in all cases.
I've noticed of late less understanding of DNS in the people charged
with maintaining it out there. Sad.
> As far as the DNS protocol goes, there's nothing different between
> the forward and reverse. But there are differences in the
> conventions used for placing data.
Yup. ;-)
--
Joe Yao
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