delegating NS control of subdomain to another BIND

["Martin F. Krafft" <madduck@madduck.net>]

... and i really thought i was down with BIND8/9...

i can't seem to find a solution to the following problem:
(sorry for the sizely post...)

mydomain.org is handled by ns{1,2}.mydomain.org.
so ns1.mydomain.org has a zone for mydomain.org, with an entry
  mydomain.org IN NS ns1.mydomain.org
and ns2.mydomain.org slaves this zone.

now i would like to create a new zone, subdomain.mydomain.org,
and i want it to be controlled by two separate nameservers,
ns{1,2}.subdomain.mydomain.org.

i thought that i could simply create an entry
  subdomain IN NS ns1.subdomain.mydomain.org
            IN NS ns2.sybdomain.mydomain.org
within the mydomain.org zone, and then any request to
subdomain.mydomain.org and its children are delegated to
ns{1,2}.subdomain.mydomain.org.

the subdomain.mydomain.org zone contains an A record for @ as well as
A records for ns1 and ns2 plus some other A records for other hosts.

now, from a host that uses ns{1,2}.mydomain.org as its nameservers, i
am doing the following tests:

ns1.mydomain.org           => 192.168.14.1
ns2.mydomain.org           => 192.168.14.11
ns1.subdomain.mydomain.org => 192.168.14.13
ns2.subdomain.mydomain.org => 192.168.14.14

(1) direct queries agains ns{1,2}.subdomain.mydomain.org
    (this all works for both).

  fishbowl:~> host -t ns subdomain.mydomain.org 192.168.14.13
  subdomain.mydomain.org         NS      ns2.subdomain.mydomain.org
  subdomain.mydomain.org         NS      ns1.subdomain.mydomain.org

  fishbowl:~> host subdomain.mydomain.org 192.168.14.13
  subdomain.mydomain.org         A       192.168.14.21
  
  fishbowl:~> host ns1.subdomain.mydomain.org 192.168.14.13
  ns1.subdomain.mydomain.org     A       192.168.14.13
  
  fishbowl:~> host ns2.subdomain.mydomain.org 192.168.14.13
  ns2.subdomain.mydomain.org     A       192.168.14.14
  
  fishbowl:~> host mail.subdomain.mydomain.org 192.168.14.13
  mail.subdomain.mydomain.org    A       192.168.14.7

          ===> ns{1,2}.subdomain.mydomain.org correctly resolve their
               zones

(2) queries agains ns{1,2}.mydomain.org
    (this all works for both)
  
  fishbowl:~> host -t ns mydomain.org 192.168.14.1
  mydomain.org                   NS      ns1.mydomain.org
  mydomain.org                   NS      ns2.mydomain.org
  
  fishbowl:~> host -t ns subdomain.mydomain.org 192.168.14.1
  subdomain.mydomain.org         NS      ns1.subdomain.mydomain.org
  subdomain.mydomain.org         NS      ns1.subdomain.mydomain.org
   !!! subdomain.mydomain.org NS host ns1.subdomain.mydomain.org does
     not exist
   !!! subdomain.mydomain.org NS host ns2.subdomain.mydomain.org does
     not exist
  subdomain.mydomain.org has lame delegation to
    ns1.subdomain.mydomain.org
  subdomain.mydomain.org has lame delegation to
    ns2.subdomain.mydomain.org

  fishbowl:~> host ns1.subdomain.mydomain.org 192.168.14.1
  ns1.subdomain.home.madduck.net does not exist (Authoritative answer)

  fishbowl:~> host mail.subdomain.mydomain.org 192.168.14.1
  ns2.subdomain.home.madduck.net does not exist (Authoritative answer)

do you have any ideas how i can configure this?

thanks,
martin;              (greetings from the heart of the sun.)
  \____ echo mailto: !#^."<*>"|tr "<*> mailto:"; net@madduck
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