Re: [apps-discuss] [taugh.com-standards] Comments on draft-levine-orgboundary

["John R Levine" <[e-mail]>]

> A query to _ob.ca might yield a response that indicates boundaries at the
> federal, provincial, and municipal levels, such as "ob=1 ca on.ca
> toronto.on.ca".  The issue I can see is that in fact there are domains in
> .ca, domains in .on.ca (and the other twelve), and domains in the
> municipal-level domains which as I recall number in the thousands in
> Canada.  It would be impossible to enumerate them all in a reply to _ob.ca,
> certainly without switching to TCP or having some kind of indirection.
> Might it be better to have a reply syntax that can indicate "stuff can be
> registered here and up to n levels below"?

Unfortunately, that doesn't work.

   aaa.foo.ontario.ca and bbb.foo.ontario.ca are the same entity

   aaa.toronto.ontario.ca and bbb.toronto.ontario.ca are not

This argues for going back to the wildcard hack, with records like

  *.ontario._ob.ca TXT "ontario.ca"
  *.toronto.ontario._ob.ca TXT "toronto.ontario.ca"

These have lousy DNS cache behavior, but the closest encloser rule means 
that you can find the cut point for any domain with one UDP lookup.

Regards,
John Levine, [e-mail], Taughannock Networks, Trumansburg NY
"I dropped the toothpaste", said Tom, crestfallenly.