Internal DNS Inverse Configuration

[Nick Allum]

I have an internal Solaris Bind 8 Server and we are looking to improve
performance with regards to inverse entries. We have an internal 10
network and have inverse entries for some of our devices. The problem is
when we do an inverse lookup on a 10 address that is not in dns it takes
a bit of time to come back with a failed response. I understand that
there is a way so if the inverse entry is not there for one of our 10
addresses we can get the dns server to quickly respond. Does anyone know
what the configuration is.