no use of reverse namelookup

Hi, how can I say a host, that it should not try to identify the name of a ipadress using reverse namelookup. The nameserver we use has no in-addr. arpa and isn't working with ptr-records. At the moment the hosts will try to identify the name and after a little time they get a timeout. Thanks for help in advance. Regards, Ruprecht ----------------------------------------------------------- INTERNOLIX Standards for eBusiness ------------------------------------------------------------ INTERNOLIX AG Ruprecht Helms System-Engineer http://www.internolix.com mail:helms@internolix.com Weiherstr. 20 Tel: +49-[0]7533-9945-71 78465 Konstanz Fax: +49-[0]7533-9945-79