You can configure a server to refuse recursive requests from a specific client or from all clients that contact the server for lookups. When a request is received, the server responds with locally available data or forwards the request to another server.
To deny recursive requests from a specific client, type the following command:
recursivedns -
<ip_address_server>
Note: You must specify the IP address of the server for which you want to refuse recursion.
To deny recursive requests from all clients that contact the server, type the following command:
recursivedns -all