Please, could you tell me what MultiNAT means? Why do you use it on the Cisco PIX Systems?
I don’t know dnsmasq. The Bind configured in Zeroshell use as backend Database the OpenLDAP server. Is dnsmasq able to extract the zone information by using the LDAP protocol?
If the Bind DNS is configured to accept dynamic updates, it can be updated by the dhcp server when it assigns the leases.