On 21 Feb 2003, D. J. Bernstein wrote:
Whenever you have a parent and child zones under different administrative
controls it is impossible to change both zones simultaniously.
Set the clocks correctly, and schedule the change on all the servers for
a particular time, using (for example) the tinydns timestamp feature
described in http://cr.yp.to/djbdns/tinydns-data.html. When that time
rolls around, all the servers will change their data simultaneously, as
RFC 1034 requires.
Yes, this is difficult to achieve with BIND, AXFR, etc. But it's easy to
achieve with better software, better replication protocols, etc. You're
making a fool of yourself when you call it ``impossible.''
This could be done with a slight change to AXFR. Lets include it in the
MAXFR proposal (the axfr mods, taken out of the "clarification".