Hi I got some replies to my question Thanks goes to Alain Fontaine (Post master, UCL) and Barry Margolin, barmar at genuity.net. The solution is as follows acl trusted { !someip , somenet/24;}; allow-query {trusted;}; This prevents the someip for making querys to the nameserver Isn't it said all the time that named.conf has C-like syntax??? Thanks Hysen