Deny query from a single IP

[Prabhat Rana]

Hello,
I have BIND 9.5running on a Solaris10 box. It provides recursive DNS service. I'm trying to implement a script where it reads the BIND stats file for all the incoming queries and if there are too many queries from a single user (source IP) it will block queries from that particular IP. In order for this to occur is there a parameter similar to allow-query that I can inject into the named.conf to block query from a single IP address when this condition occurs? Basically I'm trying to add a tool to detect potential DOS attacks where we see too many queries from one single IP. Any other suggestions would also be appreciated.

Thanks
Prabhat.