forwarding 'almost all' queries to forwarder

[Cricket Liu]

> I have a caching nameserver that is authoritative for
> a small set of bogus local internal-only domains, and
> simply forwards everything it's not authoritative for to
> a forwarder that can resolve real internet hosts.
> 
> We also have a separate internal .foo.net set of domains
> that are visible internally only and that can be
> resolved by a separate internal-only nameserver.
> 
> How can I point my nameserver for .foo.net to internal-only
> nameserver 'B' while ensuring that all other queries,
> including the rest of .net, go to external nameserver 'A' ?
> 
> Is there a simple way of tweaking named.conf to
> get this kind of behavior ?