Forwarding to two servers

[CLOSE Dave (DAE)]

My company has two internal name servers accessible to me. One (PUB) is 
the usual Internet-facing server than can resolve most internal and all 
public names. The other (PRIV) is a special purpose server that only 
resolves names in a special private domain. If I list both servers in 
resolv.conf, some names cannot be resolved. If PUB is listed first, 
names in the special domain fail; if PRIV is listed first, all other 
names fail.

It has been suggested that running a forwarding name server of my own 
might provide a solution. I have tried that, but without success. The 
BIND 9 Administrator Reference doesn't seem to address forwarding with 
any relevant examples, so perhaps I'm not doing something right. Here's 
what I have tried.

I took the named.conf provided by Fedora 13 (bind-9.7.1-2.P2.fc13.i686), 
commented all the IPv6 lines, and added two options:
   forwarders { PRIV; PUB; };
   forward only;
(Using the correct IP addresses for PRIV and PUB, of course.)

After starting the service, only names in the private domain are 
resolved. "dig @localhost" for any other name returns an Authority 
section that shows the private domain's authority, but no Answer section.

What is the right way to accomplish my purpose? If I'm on the right 
track, what did I do wrong?
-- 
Dave Close