Is it possible to define what clients are allowed to connect?

Hello,
under certain circumstances i would like to have the possibility to define what clients are allowed to connect to the database. I was trying to find something like an "access list" for the listener configuration in which one can define what computers will be allowed by the listener to connect to the db, but unfortunately i didn't succeed.
Do you know if something like this exists? (its about an old 9.2 db...)

Sorry, it seems this already is what i was looking for:
http://www.dba-oracle.com/security/node_filtering.htm
I will give it a try
kind regards

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Is it possible to define what clients are allowed to connect?

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