bind9 delegation

[ubuntu at acrasis.net]

On a small network, a host 'neptune' is the nameserver for an internal
domain 'nicklan'.  I would like one of the hosts, 'nicklite.nicklan', to
be the nameserver for the subdomain 'jupiter.nicklan'.  The hosts in
this subdomain will all be one and the same as 'nicklite.nicklan'.

neptune and nicklite both run bind9.  The respective zone files are

neptune:
   @ IN SOA neptune.nicklan. root.localhost. (
       56   ; Serial
      3h   ; Refresh
      1h   ; Retry
      1w   ; Expire
      1h ) ; Negative Cache TTL
   ;
              IN   NS   neptune.nicklan.

   @          IN  A   172.23.63.2
   neptune    IN  A   172.23.63.2
   nicklite   IN  A   172.23.63.100

   ; Attempt delegation of 'jupiter' subdomain.
   jupiter.nicklan.  IN NS ns.jupiter.nicklan.
   ns.jupiter.nicklan. A 172.23.63.100

nicklite:
   @ IN SOA ns.jupiter.nicklan. root.localhost. (
       32   ; Serial
      3h   ; Refresh
      1h   ; Retry
      1w   ; Expire
      1h ) ; Negative Cache TTL
   ;
              IN   NS   ns.jupiter.nicklan.

   @          IN  A   172.23.63.100
   ns         IN  A   172.23.63.100
   foo        IN  CNAME  ns

The nameserver on nicklite seems to work, e.g.

   # host foo.jupiter.nicklan.
   foo.jupiter.nicklan is an alias for ns.jupiter.nicklan.
   ns.jupiter.nicklan has address 172.23.63.100

Likewise the nameserver on neptune, e.g.

   # host nicklite.nicklan.
   nicklite.nicklan has address 172.23.63.100

But the nameserver on neptune does not seem to know about the subdomain:

   # host foo.jupiter.nicklan.
   Host foo.jupiter.nicklan not found: 3(NXDOMAIN)

Am I trying to do something infeasible, and if not, how to make it work?
-- 
KM