WildcardCllients

Hello List, i use freeradius 0.8.1 coming with my distribution (yes, older system) Is it necessary to declare every single client in clients.conf ? I want to use a "wildcard" client ip 0.0.0.0 to accept every client. This client ip is accepted in clients.conf but connect of real ip is ignored which is logged. I tried with 0.0.0.0/0 but this is errorneous. Is this setup possible or not wanted by developers? I did search the faq and web but did not found related topics. Thank you Andre