On Thu, Apr 13, 2006 at 01:08:10AM +0000, John Levine wrote:
There's no threat. Despite a certain amount of wishful thinking to
the contrary, the design of DNS makes subdomains absolutely completely
under the control of the domains from which they are delegated. If
quite the opposite is true, that's what delegations are for. I'd agree
it's not a threat - but a misconception. Hierarchy in naming does neither
imply nor follow hierarchy in administration (or administrative control).
Any attempt to set 'domain wide' defaults or values misses that fact.
It's related to "DNS tree climbing" or lessons (not) learned from RFC 1535.
-Peter
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