Need help explaining to Limelight

Joseph S D Yao jsdy at
Tue Oct 24 02:43:35 UTC 2006

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
> > domain.
> I'd say there is some magic.  Possibly.

There are conventions.  There is RFC 2317.  There is no magic.  ;-)

You can have subdomains and  You can have a pointer at, 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  ;-)

> If an admin were granted the authority for a /25 worth of space, then 
> you can't just delegate that part of the 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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